1. Chronic HDV infection for at least 6 months in duration, documented by a positive HDV antibody test and HDV RNA ≥ 500 IU/mL. Note: All genotypes of HDV permitted. 2. Demonstrable suppression of HBV DNA following at least 12 weeks of anti-HBV nucleos(t)ide treatment with entecavir or tenofovir prior to initiating therapy. 3. Serum ALT > 1.3 x upper limit of the normal range (ULN) and < 10 x ULN. 4. Baseline liver biopsy demonstrating evidence of chronic hepatitis. 5. ECGs demonstrating no acute ischemia or clinically significant abnormality. 6. Normal dilated retinal examination. General Exclusions 1. Previous use of LNF within 12 months. 2. Current or previous history of decompensated liver disease. 3. Co-infected with human immunodeficiency virus or hepatitis C virus (HCV) by detectable HIV RNA and HCV RNA, respectively. 4. Evidence of significant portal hypertension. 5. Current evidence or history of ascites requiring diuretics or paracentesis, or hepatic encephalopathy. 6. History of hepatocellular carcinoma. 7. Patients with any of the following:
• Current eating disorder
• Evidence of alcohol substance use disorder.
• Drug abuse within the previous 6 months before screening. 8. Prior history or current evidence of any of the following:
• Immunologically mediated disease,
• Retinal disorder or clinically relevant ophthalmic disorder,
• Any malignancy within 5 years before screening,
• Cardiomyopathy or significant ischemic cardiac or cerebrovascular disease,
• Chronic pulmonary disease,
• Pancreatitis or colitis,
• Severe or uncontrolled psychiatric disorder. 9. Other significant medical condition that may require intervention during the study. 10. Any condition that may impact proper absorption. 11. Therapy with an immunomodulatory agent, IFN-α (eg, IFN alfa-2a or IFN-alfa-2b, or pegylated IFN-alfa-2a or alfa 2b), cytotoxic agent, or chronic systemic corticosteroids within 12 months of screening. 12. Use of heparin or warfarin. 13. Systemic antibiotics, antifungals, or antivirals for treatment of active infection other than HBV. 14. Receipt of systemic immunosuppressive therapy. 15. History or evidence for any intolerance or hypersensitivity to LNF, RTV, PEG IFN-alfa-2a, tenofovir or entecavir.

Key
• Informed consent and assent (as applicable) per Institutional Review Board/Ethics Committee (IRB/EC)
• Male or female subjects with a body weight ≥ 5.0 kg, who are ≥ 12 months and < 18 years of age at time of baseline
• Cholestasis as manifested by total sBA ≥ 3× Upper Limit of Normal (ULN) (applies to primary cohort only)
• Moderate Pruritus
• Diagnosis of PFIC based on:
• Chronic cholestasis as manifested by persistent (>6 months) pruritus, in addition to biochemical abnormalities and/or pathological evidence of progressive liver disease and
• Primary Cohort: Subjects with genetic testing results consistent with biallelic disease-causing variation in ABCB11 (PFIC2), based on standard of care genotyping
• Supplemental Cohort: i. Subjects with genetic testing results consistent with biallelic disease-causing variation in ATP8B1 (PFIC1), ABCB4 (PFIC3), or TJP2 (PFIC4), based on standard of care genotyping ii. Subjects with PFIC phenotype without a known mutation or with another known mutation not described above or with intermittent cholestasis as manifested by fluctuating sBA levelsiii. Subjects with PFIC after internal or external biliary diversion surgery or for whom internal or external biliary diversion surgery was reversed
• Predicted complete absence of bile salt excretion pump (BSEP) function based on the type of ABCB11 mutation (PFIC2), as determined by a standard of care genotyping (applies to primary cohort only). Subjects can enter the study in the Supplemental Cohort (under inclusion criteria 6.ii or 6.iii).
• Recurrent intrahepatic cholestasis, indicated by a history of sBA levels <3x ULN or intermittent pruritus (applies to primary cohort only)
• Current or recent history (<1 year) of atopic dermatitis or other non-cholestatic diseases associated with pruritus
• History of surgical disruption of the enterohepatic circulation (applies to primary cohort only)
• Chronic diarrhea requiring intravenous fluid or nutritional intervention for the diarrhea and/or its sequelae at screening or during the 6 months prior to screening
• Previous or need for imminent liver transplant
• Decompensated cirrhosis (international normalized ratio [INR] > 1.5, and/or albumin < 30 g/L, history or presence of clinically significant ascites, and/or variceal hemorrhage, and/or encephalopathy)
• Alanine aminotransferase (ALT) or total serum bilirubin (TSB) > 15× ULN at screening
• Presence of other liver disease
• Presence of any other disease or condition known to interfere with the absorption, distribution, metabolism or excretion of drugs, including bile salt metabolism in the intestine (e.g., inflammatory bowel disease), per Investigator discretion
• Possibly malignant liver mass on imaging, including screening ultrasound
• Known diagnosis of human immunodeficiency virus (HIV) infection
• Any prior cancer diagnosis (except for in situ carcinoma) within 5 years of the screening visit (Visit 0)
• Any known history of alcohol or substance abuse
• Administration of bile acids or lipid binding resins, or phenylbutyrate during the screening period
• Administration of any investigational drug, biologic, or medical device during the screening period
• Previous use of an ileal bile acid transporter inhibitor (IBATi)
• History of non-adherence to medical regimens, unreliability, medical condition, mental instability or cognitive impairment that, in the opinion of the Investigator or Sponsor medical monitor, could compromise the validity of informed consent, compromise the safety of the subject, or lead to nonadherence with the study protocol or inability to conduct the study procedures.

• Patient must have an Eastern Cooperative Oncology Group (ECOG) performance status 0-1
• Patient must have a life expectancy >= 12 weeks
• Patient must have histologically confirmed intrahepatic cholangiocarcinoma or biphasic hepatocellular carcinoma and cholangiocarcinoma that is metastatic or unresectable and who have progressed on or been intolerant of one prior line of systemic gemcitabine containing chemotherapy regimen.
• NOTE: Prior immunotherapy or targeted therapies are allowed and will not be considered a line of therapy unless administered with cytotoxic chemotherapy
• Patient must have measurable disease. For patients who have received localized therapy (embolization, chemoembolization, radiofrequency ablation or radiation) are eligible if measurable disease is not within the treatment field or the treated disease has clearly progressed since last localized therapy
• Leukocytes >= 3,000/mcL (obtained within 14 days prior to randomization)
• Absolute neutrophil count >= 1,500/mcL (obtained within 14 days prior to randomization)
• Platelets >= 100,000/mcL (obtained within 14 days prior to randomization)
• Total bilirubin =< institutional upper limit of normal (ULN) except in patients with Gilbert's syndrome. Patients with Gilbert's syndrome may enroll if direct bilirubin =< 1.5 x ULN of the direct bilirubin (obtained within 14 days prior to randomization)
• Hemoglobin >= 9 g/dL (obtained within 14 days prior to randomization)
• Aspartate aminotransferase (AST) (serum glutamic-oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT]) =< 2.5 x institutional ULN (obtained within 14 days prior to randomization)
• Creatinine =< institutional ULN, OR glomerular filtration rate (GFR) >= 40 mL/min/1.73 m^2 (obtained within 14 days prior to randomization)
• Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial. Known HIV positive patients who meet the following criteria will be considered eligible:
• CD4 count >= 350 cells/mm^3
• Undetectable viral load
• Maintained on modern therapeutic regimens utilizing non-CYP interactive agents (i.e. excluding ritonavir)
• No history of acquired immunodeficiency syndrome (AIDS)-defining opportunistic infections
• For patients with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated
• Patients with a history of hepatitis C virus (HCV) infection must have been treated and cured. For patients with HCV infection who are currently on treatment, they are eligible if they have an undetectable HCV viral load
• Patients who received prior platinum or taxane chemotherapy are eligible
• Patients with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial
• Patients with known history or current symptoms of cardiac disease, or history of treatment with cardiotoxic agents, should have a clinical risk assessment of cardiac function using the New York Heart Association Functional Classification. To be eligible for this trial, patients should be class 2B or better. In addition, patients with any of the known cardiopulmonary disease, defined as follows, would be ineligible for this trial:
• Unstable angina
• Congestive heart failure (New York Heart Association [NYHA] class III or IV;);
• Myocardial infarction within 6 months prior to randomization (patients who had ischemic heart disease such as acute coronary syndrome [ACS], myocardial infarction, and/or revascularization greater than 6 months before randomization and who are without cardiac symptoms may enroll)
• Symptomatic cardiomyopathy
• Clinically symptomatic pulmonary hypertension requiring pharmacologic therapy
• Clinically significant arrhythmia, defined as:
• History of polymorphic ventricular fibrillation or torsade de pointes,
• Permanent atrial fibrillation, defined as continuous atrial fibrillation for >= 6 months,
• Persistent atrial fibrillation, defined as sustained atrial fibrillation lasting > 7 days and/or requiring cardioversion in the 4 weeks before randomization,
• Grade 3 atrial fibrillation defined as symptomatic and incompletely controlled medically, or controlled with device (e.g., pacemaker), or ablation
• Patients with paroxysmal atrial fibrillation or grade < 3 atrial fibrillation for period of at least 6 months are permitted to enroll provided that their rate is controlled on a stable regimen
• Patients must have the ability to understand and the willingness to sign a written informed consent document
• Participants with impaired decision-making capacity (IDMC) who have a legally authorized representative (LAR) or caregiver and/or family member available will also be considered eligible
• Patients must not have had major surgery within 14 days before randomization. Patients with surgery planned during study period are ineligible
• Women must not be pregnant or breast-feeding due to the potential harm to an unborn fetus and possible risk for adverse events in nursing infants with the treatment regimens being used. Patients must also not expect to conceive or father children from the time of registration, while on study treatment, and until at least 4 months after the last dose of study treatment. All females of childbearing potential must have a blood test or urine study within 14 days prior to randomization to rule out pregnancy. A female of childbearing potential is any woman, regardless of sexual orientation or whether they have undergone tubal ligation, who meets the following criteria: 1) has achieved menarche at some point, 2) has not undergone a hysterectomy or bilateral oophorectomy; or 3) has not been naturally postmenopausal (amenorrhea following cancer therapy does not rule out childbearing potential) for at least 24 consecutive months (i.e., has had menses at any time in the preceding 24 consecutive months)
• Women of childbearing potential and sexually active males must not expect to conceive or father children by using accepted and effective method(s) of contraception or by abstaining from sexual intercourse for the duration of their participation in the study and continue for at least 4 months after the last dose of protocol treatment
• Male patients must not donate sperm during the course of this study or within 4 months after receiving their last dose of protocol treatment
• Female patients must not donate eggs (ova) during the course of this study or within 4 months after receiving their last dose of protocol treatment
• Patient must not have a prolonged rate corrected QT (QTc) interval >= 480 msec calculated according to institutional guideline
• Patients who have not recovered from adverse events due to prior anti-cancer therapy (i.e. have residual toxicities > grade 1) are ineligible with the exception of alopecia
• Patients with persistent >= grade 2 diarrhea lasting more than 3 days within 14 weeks of randomization are ineligible
• Patients with known central nervous system (CNS) involvement are ineligible
• Patients must not be receiving any other investigational agents
• Patients must not have received chemotherapy or radiotherapy within 2 weeks prior to randomization. Prior treatment with radiation therapy involving >= 25% of hematopoietically active bone marrow will be ineligible
• Patients must not have received immunotherapy within 8 weeks prior to randomization
• Patients must not have a history of allergic reactions attributed to compounds of similar chemical or biologic composition to pevonedistat, carboplatin, or paclitaxel
• Patient must not be receiving any treatment with clinically significant metabolic enzyme inducers within 14 days before the first dose of the study drug as below. Clinically significant metabolic enzyme inducers are not permitted during the study. Patients must not be receiving any medications or substances that are strong inducers of CYP3A4/5 (i.e. phenytoin, rifampin, St. Johns wort) or inhibitors of breast cancer resistance protein (BCRP) (i.e. cyclosporine). Because the lists of these agents are constantly changing, it is important to regularly consult a frequently-updated medical reference. As part of enrollment/informed consent procedures, the patient will be counseled on the risk of interactions with other agents, and what to do if a new medication need to be prescribed or if the patient is considering a new over-the-counter medicine or herbal product. Inhibitors of CYP3A4/5 are allowed
• Patients must not have uncontrolled intercurrent illness
• Patients must not have uncontrolled coagulopathy or bleeding disorder
• Patients must not have active, uncontrolled infection or severe infectious disease such as severe pneumonia, meningitis, or septicemia
• Patients with known moderate chronic obstructive pulmonary disease, interstitial lung disease, and pulmonary fibrosis are ineligible
• Patients must not have psychiatric illness/social situations that would limit compliance with study requirements
• Participants must not have had prior pevonedistat treatment

• Patient must have histologically proven T1-2N0M0 invasive anal canal or anal margin squamous cell carcinoma with tumors measuring =< 4 cm within 4 weeks prior to randomization. This may include tumors of non-keratinizing histology such as basaloid, transitional cell or cloacogenic histology. Patients with T1N0M0 anal margin squamous cell carcinoma who underwent surgical excision with negative margins are not eligible
• Patients who are human immunodeficiency virus (HIV)-negative must not have lymph nodes that are radiographically-concerning for cancer involvement using computed tomography (CT) and positron emission tomography (PET)/CT-based criteria. Measurable disease is not required
• Patients who are HIV-negative and do not have lymph nodes classified as lymph node positive, but are felt to be borderline for cancer involvement must undergo central imaging review
• NOTE: Patients requiring central imaging review will be pre-registered to Arm S. Upon central confirmation of no lymph node involvement, eligible patients may proceed to randomization on Step 1
• Patients will be considered to be lymph node (LN) positive and thereby not eligible in this study if the lymph nodes meet any of the following criteria:
• Mesorectal, presacral, internal iliac or obturator LN with:
• Short axis measuring > 5 mm based on CT / magnetic resonance imaging (MRI) OR
• Morphologic features of irregular border or central necrosis if assessed on MRI and LN measures > 3 mm OR
• Fludeoxyglucose F-18 (FDG) uptake > blood pool (Deauville 3-5) based on PET/CT
• External Iliac and common Iliac:
• Short-axis measuring > 1 cm based on CT / MRI OR
• Morphologic features of irregular border or central necrosis based on CT / MRI OR
• FDG uptake > blood pool (Deauville 3-5) based on PET/CT
• Inguinal LN (superficial and deep) meeting any of the following criteria will be ineligible unless an FNA is performed and resulting cytology is negative.
• Morphologic features of irregular border or central necrosis based on CT / MRI
• FDG uptake > liver (Deauville 4) based on PET/CT.
• Patients who are HIV-negative and have inguinal lymph nodes that do not meet the above criteria must undergo fine needle aspiration and have negative histology to be eligible.
• Patients who are HIV-positive must have
• A CD4 count >= 300
• Confirmation of no lymph node involvement by central real-time review of imaging
• NOTE: Patients will be pre-registered to Arm S. Upon central confirmation of no lymph node involvement, eligible patients may proceed to randomization on Step 1
• Patient must have Eastern Cooperative Oncology Group (ECOG)
•American College of Radiology Imaging Network (ACRIN) performance status of 0-2
• Patient must have no history of prior radiation or chemotherapy for this malignancy
• Patient must not have had prior potentially curative surgery (i.e. abdominal-perineal resection) for carcinoma of the anus
• Patients with excisional biopsy procedure are eligible provided there was tumor involvement of the anal canal and/or anal verge prior to resection
• Patient must not be receiving any other standard anti-cancer therapy or experimental agent concurrently with the study drugs
• Patient must not have intercurrent illness including, but not limited to, ongoing or active infection or psychiatric/social situations that, in the judgement of the investigator, would limit compliance with study requirements
• Patient must not have had significant cardiovascular disease including myocardial infarction, unstable angina, stroke, transient ischemic attack, symptomatic coronary artery disease, symptomatic congestive heart failure, or uncontrolled cardiac arrhythmia within 6 months of randomization
• Patient must not have a history of a different malignancy unless they have been disease-free for at least 2 years and are deemed by the investigator to be at low risk of recurrence
• Individuals with the following cancers are eligible if diagnosed and treated within the past 5 years: cervical cancer in situ and basal cell or squamous cell carcinoma of the skin
• Patient must not have active autoimmune or connective disease
• Patients who are on anti-coagulation with warfarin within 2 weeks prior to registration and are considering the use of capecitabine, must use an alternative anti-coagulant
• NOTE: Low molecular weight heparin is permitted provided the patient's prothrombin time (PT)/international normalized ratio (INR) is < 1.5
• Patients who will receive capecitabine and are on Dilantin for a seizure disorder must have Dilantin levels checked weekly
• Hemoglobin > 10 g/dL (within 2 weeks prior to registration)
• Platelets >= 100,000/mm^3 (within 2 weeks prior to registration)
• Absolute neutrophil count >= 1500/mm^3 (within 2 weeks prior to registration)
• Serum creatinine must be < 1.5 X upper limit of normal (ULN), or calculated creatinine clearance must be > 60 ml/min (within 2 weeks prior to registration)
• Total bilirubin must be < 2 X ULN (within 2 weeks prior to registration)
• Aspartate aminotransferase (AST)/alanine aminotransferase (ALT) =< 2.5 X institutional ULN (within 2 weeks prior to registration)
• Albumin >= 3.0 g/dL (within 2 weeks prior to registration)
• Women must not be pregnant or breast-feeding because the study treatment administered may cause harm to an unborn fetus or breastfeeding child. All females of childbearing potential must have a blood test or urine study within 2 weeks prior to registration to rule out pregnancy. A female of childbearing potential is any woman, regardless of sexual orientation or whether they have undergone tubal ligation, who meets the following criteria: 1) has achieved menarche at some point, 2) has not undergone a hysterectomy or bilateral oophorectomy; or 2) has not been naturally postmenopausal (amenorrhea following cancer therapy does not rule out childbearing potential) for at least 24 consecutive months (i.e., has had menses at any time in the preceding 24 consecutive months)
• Women of childbearing potential and sexually active males must be strongly advised to use accepted and effective method(s) of contraception or to abstain from sexual intercourse for the duration of their participation in the study and for at least 6 months after the completion of treatment

• Newly diagnosed untreated metastatic adenocarcinoma of the pancreas. However, previous surgery, adjuvant chemotherapy and/or radiation therapy will be allowed, provided radiation therapy is completed at least 2 weeks prior to registration and adjuvant therapy was administered more than 6 months prior to registration. Patients with the following histology are excluded: acinar cell; adenosquamous carcinoma
• Eastern Cooperative Oncology Group (ECOG) performance status 0-2
• Patient is an English speaker with the ability to understand and complete the informed consent and questionnaires
• Leukocytes >= 3,000/mcL (obtained within 4 weeks of registration)
• Absolute neutrophil count >= 1,500/mcL (obtained within 4 weeks of registration)
• Platelets >= 100,000/mcL (obtained within 4 weeks of registration)
• Total bilirubin =< institutional upper limit of normal (ULN) (obtained within 4 weeks of registration)
• Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT]) =< 2.5 x institutional ULN (obtained within 4 weeks of registration)
• Creatinine =< institutional ULN unless data exists supporting safe use at lower kidney function values, no lower than 30 mL/min/1.73 m^2 (obtained within 4 weeks of registration)
• Glomerular filtration rate (GFR) >= 40 mL/min/1.73 m^2 unless data exists supporting safe use at lower kidney function values, no lower than 30 mL/min/1.73 m^2 (obtained within 4 weeks of registration)
• Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy with undetectable viral load within 6 months of registration are eligible for this protocol. HIV positive (+) patients who are on ritonavir or/and cobicistat-based regimen must be switched to alternative anti-retroviral therapy (ART)
• For patients with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated
• Patients with a history of hepatitis C virus (HCV) infection must have been treated and cured. For patients with HCV infection who are currently on treatment, they are eligible if they have an undetectable HCV viral load
• Male patients must agree not to father children while on study
• Patients with known history or current symptoms of cardiac disease, or history of treatment with cardiotoxic agents, should have a clinical risk assessment of cardiac function using the New York Heart Association functional classification. To be eligible for this protocol, patients should be class 2B or better
• Patients must have measurable disease and scans must be done within 4 weeks of registration
• Patients classified to have mild-moderate abnormalities in any of the domains evaluated in the screening geriatric assessment and are classified as "vulnerable" are eligible. Patients classified without any abnormalities ("fit") or with severe cognitive/functional impairment or high co-morbidity score ("frail") on the screening geriatric assessment are ineligible
• Patients must agree not to take any medications or substances that are strong inhibitors or inducers of CYP3A4. Those who are randomized to liposomal irinotecan treatment arm should avoid drugs that are UGT1A1 inhibitors

Key 1. Definite or probable PBC diagnosis (consistent with American Association for the Study of Liver Diseases [AASLD] and the European Association for the Study of the Liver [EASL] practice guidelines; Lindor 2009; EASL 2009), as demonstrated by the presence of ≥2 of the following 3 diagnostic factors:
• History of elevated Alkaline phosphatase levels for at least 6 months
• Positive antimitochondrial antibody (AMA) titer or if AMA negative or in low titer (<1:80) PBC-specific antibodies (anti-GP210 and/or anti-SP100 and/or antibodies against the major M2 components [PDC-E2, 2-oxo-glutaric acid dehydrogenase complex])
• Liver biopsy consistent with PBC 2. A mean total bilirubin >ULN and ≤5x ULN and/or a mean ALP >3x ULN 3. Either is not taking UDCA (no UDCA dose in the past 3 months) or has been taking UDCA for at least 12 months with a stable dose for ≥3 months prior to Day 0 1. History or presence of other concomitant liver diseases including:
• Hepatitis C virus infection
• Active Hepatitis B infection; however, subjects who have seroconverted (hepatitis B surface antigen and hepatitis B e antigen negative) may be included in this study after consultation with the medical monitor
• Primary sclerosing cholangitis (PSC)
• Alcoholic liver disease
• Definite autoimmune liver disease or overlap hepatitis
• Nonalcoholic steatohepatitis (NASH)
• Gilbert's Syndrome 2. Presence of clinical complications of PBC or clinically significant hepatic decompensation, including:
• History of liver transplant, current placement on a liver transplant list, or current Model of End Stage Liver Disease (MELD) score >12. Subjects who are placed on a transplant list despite a relatively early disease stage (for example per regional guidelines) may be eligible as long as they do not meet any of the other exclusion criteria
• Cirrhosis with complications, including history (within the past 12 months) or presence of:
• Variceal bleed
• Uncontrolled ascites
• Encephalopathy
• Spontaneous bacterial peritonitis
• Known or suspected HCC
• Prior transjugular intrahepatic portosystemic shunt procedure
• Hepatorenal syndrome (type I or II) or screening (Visit 1 or 2) serum creatinine >2 mg/dL (178 μmol/L) 3. Mean total bilirubin >5x ULN 4. Subjects who have undergone gastric bypass procedures (gastric lap band is acceptable) or ileal resection or plan to undergo either of these procedures 5. Other medical conditions that may diminish life expectancy, including known cancers (except carcinomas in situ or other stable, relatively benign conditions) 6. If female: plans to become pregnant, known pregnancy or a positive urine pregnancy test (confirmed by a positive serum pregnancy test), or lactating 7. Known history of human immunodeficiency virus infection 8. Medical conditions that may cause nonhepatic increases in ALP (eg, Paget's disease or fractures within 3 months) 9. Other clinically significant medical conditions that are not well controlled or for which medication needs are anticipated to change during the study 10. History of alcohol abuse or other substance abuse within 1 year prior to Day 0 11. Participation in another investigational product, biologic, or medical device study within 30 days prior to Screening. Participation in a previous study of OCA is allowed with 3 months washout prior to enrollment in this study 12. Mental instability or incompetence, such that the validity of informed consent or ability to be compliant with the study is uncertain 13. History of known or suspected clinically significant hypersensitivity to OCA or any of its components 14. UDCA naïve (unless contraindicated)

Inclusion Criteria
• ≥2 years and <18 years of age for enrolment in Phase 1 or ≥2 years and ≤21 years of age for enrolment in Phase 2.
• Recurrent or refractory solid tumors
• Phase 1: All solid tumors (measurable or evaluable disease), including primary central nervous system (CNS) tumors; exclusion of hepatoblastoma and lymphomas. Participants with diffuse intrinsic pontine glioma, optic pathway glioma, or pineal tumors with elevated tumor markers (alpha-fetoprotein [AFP] and beta-human chorionic gonadotropin [ß-hCG][or human chorionic gonadotropin [hCG])do not require histological or cytological confirmation of diagnosis
• Phase 2: Ewing sarcoma/peripheral primitive neuroectodermal tumor (pPNET), Rhabdomyosarcoma, High Grade Glioma (HGG) (all must have measurable disease); exclusion of Diffuse Intrinsic Pontine Glioma
• Histologically or cytologically confirmed diagnosis
• Measurable disease that meets the following criteria (Phase 2): 1. RECIST 1.1 (for all tumor types except HGG): At least 1 lesion of ≥1.0 cm in the longest diameter for a non lymph node or ≥1.5 cm in the short-axis diameter for a lymph node which is serially measurable according to RECIST 1.1 using computed tomography /magnetic resonance imaging (CT/MRI) 2. Response Assessment in Neuro-Oncology (RANO) for high grade glioma (HGG): At least one lesion must be measurable as defined as a bi dimensionally contrast enhancing lesion with clearly defined margins by CT or MRI scan, with a minimal diameter of 1 cm, and visible on 2 axial slices which are preferably at most 5 mm apart with 0 mm skip Lesions that have had external beam radiotherapy (EBRT) or locoregional therapies such as radiofrequency (RF) ablation must show evidence of progressive disease based on RECIST 1.1 to be deemed a target lesion
• Karnofsky performance score ≥50 for participants>16 year of age and Lansky play score ≥50 for participants ≤16 years of age. Neurologic deficits in participants with CNS tumors must have been relatively stable for at least 7 days prior to study enrollment. Participants who are unable to walk because of paralysis, but who are up in a wheelchair, will be considered ambulatory for the purpose of assessing the performance score
• Prior Therapy
• Participants must have fully recovered from the acute toxic effects of all prior anti-cancer therapy
• Cytotoxic chemotherapy or other chemotherapy known to be myelosuppressive: ≥21 days after the last dose of cytotoxic or myelosuppressive chemotherapy (42 days if prior nitrosourea)
• Anti-cancer agents not known to be myelosuppressive (eg, not associated with reduced platelet or absolute neutrophil counts): ≥7 days after the last dose of agent
• Monoclonal antibodies: ≥21 days or 3 half-lives (whichever is shorter) of the antibody must have elapsed after the last dose of a monoclonal antibody (including checkpoint inhibitors). Toxicity related to prior antibody therapy must be recovered to Grade ≤1
• Corticosteroids: If used to modify immune adverse events related to prior therapy, ≥14 days must have elapsed since last dose of corticosteroid. Participants receiving corticosteroids, who have not been on a stable or decreasing dose of corticosteroid for at least 7 days prior to enrollment, are not eligible
• Hematopoietic growth factors: ≥14 days after the last dose of a long-acting growth factor or 7 days for short-acting growth factor. For agents that have known adverse events occurring beyond 7 days after administration, this period must be extended beyond the time during which adverse events are known to occur
• Interleukins, interferons, and cytokines (other than hematopoietic growth factors): ≥21 days after the completion of interleukins, interferons or cytokines (other than hematopoietic growth factors)
• Stem cell infusions (with or without total body irradiation): Allogeneic (non-autologous) bone marrow or stem cell transplant, or any stem cell infusion including donor leukocytes infusion or boost infusion: ≥84 days after infusion and no evidence of graft versus host disease; Autologous stem cell infusion including boost infusion: ≥42 days
• Cellular Therapy: ≥42 days after the completion of any type of cellular therapy (eg, modified T cells, natural killer cells, dendritic cells, etc)
• Radiotherapy (XRT)/External Beam Irradiation including Protons: ≥14 days after local XRT; ≥150 days after total body irradiation, craniospinal XRT or if radiation to ≥50% of the pelvis; ≥42 days if other substantial bone marrow radiation.
• Radiopharmaceutical therapy: ≥42 days after systemically administered therapy.
• Vascular endothelial growth factor (VEGF)/VEGF receptor (VEGFR)-targeted or mammalian target of rapamycin (mTOR)-targeted therapies: Must not have received prior exposure to lenvatinib; May have previously progressed on an mTOR inhibitor; No more than 2 prior VEGF/VEGFR-targeted therapies (For Phase 2 only); Must not have received prior VEGF/VEGFR-targeted therapy in combination with an mTOR inhibitor (For Phase 2 only)
• Adequate bone marrow function for participants with solid tumors without known bone marrow involvement
• Adequate bone marrow function for participants with known bone marrow metastatic disease
• Adequate renal function
• Adequate liver function
• Adequate cardiac function
• Adequate neurologic function
• Adequate blood pressure (BP) control with or without antihypertensive medications
• Adequate coagulation
• Adequate pancreatic function
• Adequate metabolic function
• Adequate glycemic control
• Participants must have a minimum body surface area (BSA) of 0.6 m^2 at study entry. Exclusion Criteria
• Participants who have had or are planning to have the following invasive procedures
• Major surgical procedure, laparoscopic procedure, open biopsy or significant traumatic injury within 28 days prior to enrolment
• Central line placement or subcutaneous port placement is not considered major surgery. External central lines must be placed at least 3 days prior to enrollment and subcutaneous ports must be placed at least 7 days prior to enrollment
• Fine needle aspirate within 7 days prior to enrolment
• Surgical or other wounds must be adequately healed prior to enrolment
• For purposes of this study, bone marrow aspirate and biopsy are not considered surgical procedures and therefore are permitted within 14 days prior to start of protocol therapy
• Participants who have non-healing wound, unhealed or incompletely healed fracture, or a compound (open) bone fracture at the time of enrolment
• Participants having an active infection requiring systemic therapy.
• Participants with a known history of active hepatitis B (defined as hepatitis B surface antigen reactive or hepatitis B virus- deoxyribonucleic [DNA] detected) or known active hepatitis C virus (HCV, defined as HCV- Ribonucleic acid [RNA] detected). Note: No testing for hepatitis B and hepatitis C is required unless mandated by the local health authority.
• Known to be human immunodeficiency virus (HIV) positive. Note: HIV testing is required at screening only when mandated by the local health authority
• Clinical evidence of nephrotic syndrome prior to enrolment
• Gastrointestinal bleeding or active hemoptysis (bright red blood of at least half teaspoon) within 21 days prior to enrolment
• Thrombotic/ thromboembolic event requiring systemic anticoagulation within 90 days prior to enrollment
• Evidence of new intracranial hemorrhage of more than punctate size on MRI assessment obtained within 28 days prior to study enrollment for Participants with HGG
• Diagnosis of lymphoma
• Radiographic evidence of major blood vessel invasion/infiltration.
• Evidence of untreated CNS metastases (exception: participants with primary CNS tumors and leptomeningeal disease)
• Participants who are currently receiving enzyme-inducing anticonvulsants
• Participants chronically receiving strong cytochrome P450 3A4 (CYP3A4)/P-glycoprotein (P-gp) inhibitors or inducers within 7 days prior to study enrollment
• Females who are breastfeeding or pregnant. For females of childbearing potential, a negative screening pregnancy test must be obtained within 72 hours before the first dose of study drug

• ELIGIBILITY CRITERIA FOR ENROLLMENT ONTO APEC1621SC: Patients with recurrent or refractory solid tumors, including non-Hodgkin lymphomas, histiocytoses (e.g. langerhans cell histiocytosis [LCH], juvenile xanthogranuloma [JXG], histiocytic sarcoma), and central nervous system (CNS) tumors are eligible; patients must have had histologic verification of malignancy at original diagnosis or relapse except in patients with intrinsic brain stem tumors, optic pathway gliomas, or patients with pineal tumors and elevations of cerebrospinal fluid (CSF) or serum tumor markers including alpha-fetoprotein or beta-human chorionic gonadotropin (HCG); in cases where patient enrolls prior to histologic confirmation of recurrent disease, patient is ineligible and should be withdrawn from study if histology fails to confirm recurrence; please note: Patients with Hodgkin lymphoma and plexiform neurofibroma are not eligible
• ELIGIBILITY CRITERIA FOR ENROLLMENT ONTO APEC1621SC: Patients must have an formalin-fixed paraffin-embedded (FFPE) tumor sample available for MATCH study testing from a biopsy or surgery that was performed at any point after initial tumor recurrence/progression, or be planned to have a procedure to obtain such a sample that is considered to be of potential benefit by the treating clinicians; a tumor sample from a clinically performed diagnostic (pre-treatment) biopsy will be acceptable for enrollment onto Pediatric MATCH only for children with high-grade gliomas of the brainstem (diffuse intrinsic pontine gliomas) or thalamus
• Please note: Samples that have been decalcified using standardly utilized acid-based decalcification methods are not generally suitable for MATCH study testing; the nucleic acids will have been degraded in the decalcification process
• ELIGIBILITY CRITERIA FOR ENROLLMENT ONTO APEC1621SC: Karnofsky >= 50% for patients > 16 years of age and Lansky >= 50 for patients =< 16 years of age); note: neurologic deficits in patients with CNS tumors must have been stable for at least 7 days prior to study enrollment; patients who are unable to walk because of paralysis, but who are up in a wheelchair, will be considered ambulatory for the purpose of assessing the performance score
• ELIGIBILITY CRITERIA FOR ENROLLMENT ONTO APEC1621SC: Patients must have radiographically measurable disease; measurable disease based on imaging obtained less than or equal to 56 days prior to enrollment; patients with neuroblastoma who do not have measurable disease but have metaiodobenzylguanidine (MIBG) positive (+) evaluable disease are eligible; measurable disease in patients with central nervous system (CNS) involvement is defined as tumor that is measurable in two perpendicular diameters on magnetic resonance imaging (MRI) and visible on more than one slice
• Note: The following do not qualify as measurable disease:
• Malignant fluid collections (e.g., ascites, pleural effusions)
• Bone marrow infiltration except that detected by MIBG scan for neuroblastoma
• Lesions only detected by nuclear medicine studies (e.g., bone, gallium or positron emission tomography [PET] scans) except as noted for neuroblastoma
• Elevated tumor markers in plasma or CSF
• Previously radiated lesions that have not demonstrated clear progression post radiation
• Leptomeningeal lesions that do not meet the measurement requirements for Response Evaluation Criteria in Solid Tumors (RECIST) 1.1
• GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: NOTE: patient does not need to meet all subprotocol criteria at time of enrollment onto the APEC1621SC screening protocol, but will need to meet all criteria prior to enrollment on any assigned treatment subprotocol. Patients must be enrolled onto a subprotocol within 8 weeks (56 days) of treatment assignment
• GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: Karnofsky >= 50% for patients > 16 years of age and Lansky >= 50 for patients =< 16 years of age); Note: neurologic deficits in patients with CNS tumors must have been stable for at least 7 days prior to study enrollment; patients who are unable to walk because of paralysis, but who are up in a wheelchair, will be considered ambulatory for the purpose of assessing the performance score
• GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: At the time of treatment with subprotocol specified therapy, the patients must have radiographically measurable disease; patients with neuroblastoma who do not have measurable disease but have MIBG+ evaluable are eligible; measurable disease in patients with CNS involvement is defined as tumor that is measurable in two perpendicular diameters on MRI and visible on more than one slice
• Note: The following do not qualify as measurable disease:
• Malignant fluid collections (e.g., ascites, pleural effusions)
• Bone marrow infiltration except that detected by MIBG scan for neuroblastoma
• Lesions only detected by nuclear medicine studies (e.g., bone, gallium or positron emission tomography [PET] scans) except as noted for neuroblastoma
• Elevated tumor markers in plasma or CSF
• Previously radiated lesions that have not demonstrated clear progression post radiation
• Leptomeningeal lesions that do not meet the measurement requirements for RECIST 1.1
• GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: At the time of enrollment onto a subprotocol, the following general criteria for initiation of therapy will be required:
• Patients must have fully recovered from the acute toxic effects of all prior anticancer therapy and must meet the following minimum duration from prior anticancer directed therapy prior to enrollment to the subprotocol; if after the required timeframe, the numerical eligibility criteria are met, e.g. blood count criteria, the patient is considered to have recovered adequately
• Cytotoxic chemotherapy or other anticancer agents known to be myelosuppressive: for agents not listed, the duration of this interval must be discussed with the study chair and the study-assigned research coordinator prior to enrollment >= 21 days after the last dose of cytotoxic or myelosuppressive chemotherapy (42 days if prior nitrosourea)
• Anticancer agents not known to be myelosuppressive (e.g. not associated with reduced platelet or absolute neutrophil counts [ANC]): >= 7 days after the last dose of agent; for agents not listed, the duration of this interval must be discussed with the study chair and the study-assigned research coordinator prior to enrollment
• Antibodies: >= 21 days must have elapsed from infusion of last dose of antibody, and toxicity related to prior antibody therapy must be recovered to grade =< 1
• Corticosteroids: If used to modify immune adverse events related to prior therapy, >= 14 days must have elapsed since last dose of corticosteroid
• Hematopoietic growth factors: >= 14 days after the last dose of a long-acting growth factor (e.g. Neulasta) or 7 days for short-acting growth factor; for agents that have known adverse events occurring beyond 7 days after administration, this period must be extended beyond the time during which adverse events are known to occur; the duration of this interval must be discussed with the study chair and the study-assigned research coordinator
• Interleukins, interferons and cytokines (other than hematopoietic growth factors): >= 21 days after the completion of interleukins, interferon or cytokines (other than hematopoietic growth factors)
• Stem cell infusions (with or without total-body irradiation [TBI]):
• Allogeneic (non-autologous) bone marrow or stem cell transplant, or any stem cell infusion including donor lymphocyte infusion (DLI) or boost infusion: >= 84 days after infusion and no evidence of graft versus host disease (GVHD)
• Autologous stem cell infusion including boost infusion: >= 42 days
• Cellular therapy: >= 42 days after the completion of any type of cellular therapy (e.g. modified T cells, NK cells, dendritic cells, etc.)
• X-ray therapy (XRT)/External Beam Irradiation including Protons: >= 14 days after local XRT; >= 150 days after TBI, craniospinal XRT or if radiation to >= 50% of the pelvis; >= 42 days if other substantial bone marrow (BM) radiation; note: radiation may not be delivered to "measurable disease" tumor site(s) being used to follow response to subprotocol treatment
• Radiopharmaceutical therapy (e.g., radiolabeled antibody, 131I-MIBG): >= 42 days after systemically administered radiopharmaceutical therapy
• GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: For patients with solid tumors without known bone marrow involvement:
• Peripheral absolute neutrophil count (ANC) >= 1000/mm^3
• Platelet count >= 100,000/mm^3 (transfusion independent, defined as not receiving platelet transfusions for at least 7 days prior to enrollment)
• GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: Patients with known bone marrow metastatic disease will be eligible for study provided they meet the blood counts (may receive transfusions provided they are not known to be refractory to red cell or platelet transfusions); these patients will not be evaluable for hematologic toxicity
• GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: Creatinine clearance or radioisotope glomerular filtration rate (GFR) >= 70 ml/min/1.73 m^2 or a serum creatinine based on age/gender as follows:
• Age: 1 to < 2 years; maximum serum creatinine (mg/dL): male 0.6; female 0.6
• Age: 2 to < 6 years; maximum serum creatinine (mg/dL): male 0.8; female 0.8
• Age: 6 to < 10 years; maximum serum creatinine (mg/dL): male 1; female 1
• Age: 10 to < 13 years; maximum serum creatinine (mg/dL): male 1.2; female 1.2
• Age: 13 to < 16 years; maximum serum creatinine (mg/dL): male 1.5; female 1.4
• Age: >= 16 years; maximum serum creatinine (mg/dL): male 1.7; female 1.4
• GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: Bilirubin (sum of conjugated + unconjugated) =< 1.5 x upper limit of normal (ULN) for age
• GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: Serum glutamate pyruvate transaminase (SGPT) (alanine transferase [ALT]) =< 135 U/L (for the purpose of this study, the ULN for SGPT is 45 U/L)
• GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: Patients must be able to swallow intact capsules/tablets, unless otherwise specified in the subprotocol to which they are assigned
• GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: Agent specific limitations on prior therapy will be included with specific treatment subprotocols
• GENERAL EXCLUSION CRITERIA FOR SUBPROTOCOLS: Pregnant or breast-feeding women will not be entered on this study due to risks of fetal and teratogenic adverse events as seen in animal/human studies, or because there is currently no available information regarding human fetal or teratogenic toxicities; pregnancy tests must be obtained in females who are post-menarchal; males or females of reproductive potential may not participate unless they have agreed to use an effective contraceptive method
• GENERAL EXCLUSION CRITERIA FOR SUBPROTOCOLS: Concomitant medications
• Corticosteroids: at the time of consent and enrollment to regimen specific subprotocols, patients receiving corticosteroids who have not been on a stable or decreasing dose of corticosteroid for at least 7 days prior to enrollment to the subprotocol will not be eligible; if used to modify immune adverse events related to prior therapy, >= 14 days must have elapsed since last dose of corticosteroid
• Investigational drugs: patients must meet criteria for prior therapy at the time of consent and enrollment to a subprotocol; other investigational agents may not be administered to patients while they are receiving study drug as part of a subprotocol
• Anticancer agents: patients must meet criteria for prior therapy at the time of consent and enrollment to a subprotocol; other investigational agents may not be administered to patients while they are receiving study drug as part of a subprotocol
• Anti-GVHD agents post-transplant: patients who are receiving cyclosporine, tacrolimus or other agents to prevent graft-versus-host disease post bone marrow transplant are not eligible
• GENERAL EXCLUSION CRITERIA FOR SUBPROTOCOLS: Patients who have an uncontrolled infection are not eligible
• GENERAL EXCLUSION CRITERIA FOR SUBPROTOCOLS: Patients who have had a prior solid organ transplant are not eligible
• GENERAL EXCLUSION CRITERIA FOR SUBPROTOCOLS: Additional agent specific criteria will be included with specific treatment subprotocols

• ELIGIBILITY CRITERIA FOR RANDOMIZATION:
• Patients must have a renal mass consistent with a clinical stage >= T2Nx renal cell carcinoma (RCC) or TanyN+ RCC for which radical or partial nephrectomy is planned
• Patients must have no clinical or radiological evidence of distant metastases (M0) unless the presumed M1 disease is planned to be resected/definitively treated (e.g., thermal ablation, stereotactic radiation) at the same time or within a 12 week window from the date of the initial procedure such that the patient is considered "no evidence of disease" (M1 NED)
• Liver, bone, or brain metastases are not permitted
• No more than 3 metastases are permitted and all must be able to be removed or definitively treated within 12 weeks of the primary tumor resection
• If histological confirmation of RCC has not been done within 12 months prior to randomization, patient must be willing to undergo a core biopsy for this purpose if randomized to Arm A
• NOTE: This histologic confirmation can be a (1) standard of care diagnostic biopsy or (2) a research biopsy or a planned metastasectomy. Tissue must be obtained with results available prior to the neoadjuvant dose
• Patients randomized to Arm A: core tumor biopsy must have demonstrated RCC of any histology, including sarcomatoid, unclassified, or "unknown histology" (if preoperative biopsy was uninformative) with exception below for non-diagnostic biopsies
• If the biopsy performed following randomization clearly demonstrates a benign condition, oncocytoma or a different type of cancer that is not RCC, the patient is not eligible and must come off study
• A non-diagnostic biopsy is considered a good faith effort and does not need to be repeated unless deemed clinically necessary by the treating investigator
• Patient must not have any prior systemic or local anti-cancer therapy for the current RCC
• Patient must not have undergone a partial nephrectomy for the current RCC
• Patient must not have had a metastasectomy for the current RCC diagnosis unless performed to render patient NED (in addition to the planned nephrectomy) within 6 months of the current diagnosis
• Patient must not have received current or past antineoplastic systemic therapies for RCC: i.e., chemotherapy, hormonal therapy, immunotherapy, or standard or investigational agents for treatment of RCC
• Patient must not have received prior treatment with an anti-PD-1, anti-PD-L1, anti-PD-L2, anti-CD137, or anti-CTLA-4 antibody, or any other antibody or drug specifically targeting T-cell co-stimulation or checkpoint pathways
• Patient must have an Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1
• Patient must not have a prior history of RCC that was treated with curative intent within the past 5 years
• Patients with a prior RCC that was treated > 5 years before, are eligible if the current tumor is consistent with a new primary in the opinion of the treating investigator
• Patients with bilateral synchronous RCCs are eligible if they can be resected or definitively treated at the same time or within a 12 week window from time of initial nephrectomy (partial or radical) or procedure and maintain adequate residual renal function; the patient is not eligible if both kidneys are to be completely removed and subsequent hemodialysis will be required
• Permitted forms of local therapy for second tumor:
• Partial or radical nephrectomy
• If kidney tumor is =< 3 cm: thermal ablation (e.g., radiofrequency ablation, cryoablation or stereotactic radiosurgery)
• Patients cannot have concurrent malignancies, with the following exceptions:
• Adequately treated basal cell or squamous cell skin cancer
• In situ cervical cancer
• A history of superficial Ta urothelial cancer is permitted (as long as not currently undergoing treatment) whereas T1 or greater disease is excluded if < 3 years from diagnosis; concurrent persistent disease is not permitted
• Adequately treated stage I or II cancer from which the patient is currently in complete remission
• Any other cancer and stage from which the patient has been disease-free for at least 3 years prior to the time of randomization and as long as they are not receiving any current treatment (e.g. adjuvant or maintenance systemic or local therapy)
• Concurrent low risk prostate cancer on active surveillance
• Patient must not have active known or suspected autoimmune disease. The following autoimmune disorders are permitted: patients with vitiligo, type I diabetes mellitus, controlled/stable hypo or hyperthyroidism due to autoimmune or non-autoimmune conditions (hormone replacement is allowed), psoriasis not requiring systemic treatment, or other conditions not expected to recur
• Patient must not have any ongoing condition requiring systemic treatment with either corticosteroids (> 10 mg daily prednisone equivalent) or other immunosuppressive medications with the exceptions outlined below; patient must not have received any treatment with other immunosuppressive agents within 14 days prior to the first dose of study drug with the following exceptions:
• Topical, ocular, intra-articular, intranasal, inhaled steroids and adrenal replacement steroid doses > 10 mg daily prednisone or the equivalent are permitted in the absence of active autoimmune disease
• A brief (less than 3 weeks) course of corticosteroids (any amount) for prophylaxis (for example: contrast dye allergy) or for treatment of non-autoimmune conditions (for example: nausea, delayed-type hypersensitivity reaction caused by a contact allergen) is permitted
• Patient must not have uncontrolled adrenal insufficiency
• Patient must not have known evidence of chronic active liver disease or evidence of acute or chronic hepatitis B Virus (HBV) or hepatitis C (HCV); HBV and HCV testing must be completed within 8 weeks prior to randomization
• NOTE: If the patient has been treated and cured, and the HCV ribonucleic acid (RNA) is undetectable, the patient is eligible for this study
• Patient must not have any serious intercurrent illness, including ongoing or active infection requiring parenteral antibiotics
• Patient must not have known evidence of human immunodeficiency virus (HIV) infection, since the effects of nivolumab on anti-retroviral therapy have not been studied; HIV testing is only required if past or current history is suspected
• Patient must not have any known medical condition (e.g. a condition associated with uncontrolled diarrhea such as ulcerative colitis or acute diverticulitis) that, in the investigator's opinion, would increase the risk associated with study participation or interfere with the interpretation of safety results
• Patient must not have had any major surgery within 28 days prior to randomization
• Patient must not be currently enrolled in other clinical trials testing a therapeutic intervention
• Patient must not have any history of severe hypersensitivity to a monoclonal antibody
• Patient must have the ability to understand and the willingness to sign a written informed consent document
• Women must not be pregnant or breast-feeding, as the effects of nivolumab on the developing human fetus or in the nursing infant are unknown; all females of childbearing potential must have a blood test or urine study within 2 weeks prior to randomization to rule out pregnancy; a female of childbearing potential is defined as any woman, regardless of sexual orientation or whether they have undergone tubal ligation, who meets the following criteria: 1) has achieved menarche at some point 2) has not undergone a hysterectomy or bilateral oophorectomy; or 3) has not been naturally postmenopausal for at least 24 consecutive months (i.e., has had menses at any time in the preceding 24 consecutive months)
• Women of childbearing potential (WOCBP) and males who are sexually active with WOCBP must use accepted and effective method(s) of contraception, as described in the Informed Consent Form (ICF), or abstain from sexual intercourse for the duration of their participation in the study; women of childbearing potential must use adequate methods to avoid pregnancy for 5 months after the last dose of nivolumab; sexually active males must use adequate methods to avoid pregnancy for 7 months after the last dose of nivolumab
• White blood cells >= 2000/uL (within 8 weeks prior to randomization)
• Absolute neutrophil count (ANC) >= 1,500/mm^3 (within 8 weeks prior to randomization)
• Platelet count >= 100,000/mm^3 (within 8 weeks prior to randomization)
• Hemoglobin >= 9.0 g/dL (within 8 weeks prior to randomization)
• Serum creatinine =< 1.5 x upper limit of normal (ULN) or calculated creatinine clearance (CrCl) >= 40mL/min (within 8 weeks prior to randomization)
• Total bilirubin =< 1.5 x ULN (except subjects with Gilbert syndrome, who can have total bilirubin < 3.0 x ULN) (within 8 weeks prior to randomization)
• Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) =< 2.5 x ULN (within 8 weeks prior to randomization)

• The patient must have signed and dated an Institutional Review Board (IRB)-approved consent form that conforms to federal and institutional guidelines
• Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1 or 2
• Diagnosis of metastatic adenocarcinoma of colon or rectum without previous chemotherapy or any other systemic therapy for metastatic colorectal cancer
• Tumor determined to be mismatch-repair deficient (dMMR) by Clinical Laboratory Improvement Act (CLIA)-certified immunohistochemical (IHC) assay with a panel of all four IHC markers, including MLH1, MSH2, PMS2, and MSH6; alternatively, MSI-H diagnosed by polymerase chain reaction (PCR)-based assessment of microsatellite alterations (either Bethesda markers or Pentaplex panel) or by next-generation sequencing (NGS) are eligible
• Documentation by positron emission tomography(PET)/computed tomography (CT) scan, CT scan, or magnetic resonance imaging (MRI) that the patient has measurable metastatic disease per RECIST 1.1
• No immediate need for surgical intervention for the primary tumor or palliative diversion/bypass
• Absolute neutrophil count (ANC) must be >= 1500/mm^3 (obtained within 28 days prior randomization)
• Platelet count must be >= 100,000/mm^3 (obtained within 28 days prior randomization)
• Hemoglobin must be >= 8 g/dL (obtained within 28 days prior randomization)
• Total bilirubin must be =< 1.5 x ULN (upper limit of normal) for the lab unless the patient has a bilirubin elevation > 1.5 x ULN to 3 x ULN due to Gilbert's disease or similar syndrome involving slow conjugation of bilirubin (obtained within 28 days prior randomization); and
• Alkaline phosphatase must be =< 2.5 x ULN for the lab with the following exception: patients with documented liver metastases or bone involvement
•alkaline phosphatase must be =< 5 x ULN (obtained within 28 days prior randomization); and
• Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) must be =< 3 x ULN for the lab with the following exception: for patients with documented liver metastases, AST and ALT must be =< 5 x ULN (obtained within 28 days prior randomization)
• Serum creatinine =< 1.5 x ULN for the lab or measured (24 hour urine collection) or calculated creatinine clearance >= 30 mL/min (obtained within 28 days prior randomization)
• A urine sample tested for proteinuria by either the dipstick method, urinalysis (UA), or a urine protein creatinine (UPC) ratio:
• The dipstick method must indicate 0-1+ protein; if dipstick reading is >= 2+, a 24-hour urine must be done and it must demonstrate < 1.0 g of protein per 24 hours
• A urine protein creatinine (UPC) ratio must be < 1.0; if the UPC ratio is >= 1.0 a 24-hour urine must be done and it must demonstrate < 1.0 g of protein per 24 hours
• Urinalysis must indicate < 30 mg/dl. If urinalysis >= 30 mg/dl, a 24-hour urine must be done and it must demonstrate < 1.0 g of protein per 24 hours
• International normalized ratio of prothrombin time (INR) and prothrombin time (PT) must be =< 1.5 x ULN for the lab within 28 days before randomization; patients who are therapeutically treated with an agent such as warfarin may participate if they are on a stable dose and no underlying abnormality in coagulation parameters exists per medical history, regardless of PT/INR results
• Pregnancy test done within 14 days prior randomization must be negative (for women of childbearing potential only); pregnancy testing should be performed according to institutional standards; administration of atezolizumab or mFOLFOX6/bevacizumab/atezolizumab may have an adverse effect on pregnancy and poses a risk to the human fetus, including embryo-lethality; should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately
• Women of child-bearing potential and men must agree to use adequate contraception methods that result in a failure rate of < 1% per year during the treatment period (hormonal or barrier method of birth control; abstinence) prior to study entry, for the duration of study participation, and for 5 months (150 days) after the last dose of atezolizumab, 6 months after the last dose of bevacizumab, and 6 months after the last dose of mFOLFOX6; a woman is considered to be of childbearing potential if she is not postmenopausal, has not reached a postmenopausal state (>= 12 continuous months of amenorrhea with no identified cause other than menopause), and has not undergone surgical sterilization (removal of ovaries and/or uterus); examples of contraceptive methods with a failure rate of < 1% per year include: bilateral tubal ligation; male partner sterilization; intrauterine devices; the reliability of sexual abstinence should be evaluated in relation to the duration of the clinical study and the preferred and usual lifestyle of the patient; periodic abstinence (e.g., calendar, ovulation, symptothermal, or postovulation methods) and withdrawal are not acceptable methods of contraception; men must refrain from donating sperm during this same period
• Patients with central nervous system (CNS) metastases are excluded, with the following exceptions:
• Patients with asymptomatic untreated CNS metastases may be enrolled, provided all eligibility criteria are met, as well as the following:
• Evaluable or measurable disease outside the CNS
• No metastases to brain stem, midbrain, pons, medulla, cerebellum, or within 10 mm of the optic apparatus (optic nerves and chiasm)
• No history of intracranial hemorrhage or spinal cord hemorrhage
• No ongoing requirement for dexamethasone for CNS disease; patients on a stable dose of anticonvulsants are permitted.
• No neurosurgical resection or brain biopsy within 28 days prior to randomization
• Patients with asymptomatic treated CNS metastases may be enrolled, provided all eligibility criteria are met, as well as the following:
• No radiographic demonstration and no evidence of interim progression between the completion of CNS-directed therapy and the screening radiographic study
• No stereotactic radiation or whole-brain radiation within 28 days prior to randomization
• Screening CNS radiographic study >= 28 days from completion of radiotherapy and >= 14 days from discontinuation of corticosteroids
• Known hypersensitivity to Chinese hamster ovary cell products or other recombinant human antibodies, fluoropyrimidines, folic acid derivatives or oxaliplatin
• Uncontrolled high blood pressure defined as systolic blood pressure (BP) > 150 mmHg or diastolic BP 90 mmHg with or without anti-hypertensive medication; patients with initial BP elevations are eligible if initiation or adjustment of BP medication lowers pressure to meet entry criteria
• Any of the following cardiac conditions:
• Documented New York Heart Association (NYHA) class III or IV congestive heart failure
• Myocardial infarction within 6 months prior to randomization
• Unstable angina within 6 months prior to randomization
• Symptomatic arrhythmia
• Serious or non-healing wound, skin ulcer, or bone fracture
• History of transient ischemic attack (TIA), cerebrovascular accident (CVA), gastrointestinal (GI) perforation or arterial thrombotic event within 6 months prior to randomization, symptomatic peripheral ischemia, or other medical condition in the opinion of the treating oncologist that makes the risk of cardiovascular or bleeding complications with bevacizumab use unacceptably high
• Other malignancies are excluded unless the patient has completed therapy for the malignancy >= 12 months prior to randomization and is considered disease-free; patients with the following cancers are eligible if diagnosed and treated within the past 12 months: in situ carcinomas or basal cell and squamous cell carcinoma of the skin
• Known DPD (dihydro pyrimidine dehydrogenase) deficiency
• Symptomatic peripheral sensory neuropathy >= grade 2 (Common Terminology Criteria for Adverse Events [CTCAE] version [v] 5.0)
• Prior treatment with oxaliplatin chemotherapy within 6 months prior to randomization
• Prior treatment with anti-PD-1, or anti-PD-L1 therapeutic antibody or pathway-targeting agents; patients who have received prior treatment with anti-CTLA-4 may be enrolled provided the following requirements are met:
• Minimum of 12 weeks from the first dose of anti-CTLA-4 and > 6 weeks from the last dose to randomization
• No history of severe immune-related adverse effects (CTCAE Grade 3 and 4) from anti-CTLA-4
• Patients who have had chemotherapy or radiotherapy within 4 weeks (6 weeks for nitrosoureas or mitomycin C) prior to entering the study or those who have not recovered from adverse events (other than alopecia) due to agents administered more than 4 weeks earlier are excluded; however, the following therapies are allowed:
• Hormone-replacement therapy or oral contraception
• Herbal therapy > 7 days prior to randomization (herbal therapy intended as anticancer therapy must be discontinued at least 1 week prior to randomization)
• Palliative radiotherapy for bone metastases > 14 days prior to randomization
• Treatment with systemic immunostimulatory medications (including, but not limited to interferon [IFN]-alpha or interleukin [IL]-2 within 42 days prior to randomization
• Treatment with systemic immunosuppressive medications (including, but not limited to, prednisone, cyclophosphamide, azathioprine, methotrexate, thalidomide, and anti-tumor necrosis factor [anti-TNF] agents) within 14 days prior to randomization; however,
• Patients who have received acute, low dose, systemic immunosuppressant medications (e.g., a one-time dose of dexamethasone for nausea; or chronic daily treatment with corticosteroids with a dose of =< 10 mg/day methylprednisolone equivalent) may be enrolled
• The use of inhaled corticosteroids and mineralocorticoids (e.g., fludrocortisone) for patients with orthostatic hypotension or adrenocortical insufficiency is allowed
• Patients taking bisphosphonate therapy for symptomatic hypercalcemia; use of bisphosphonate therapy for other reasons (e.g., bone metastasis or osteoporosis) is allowed
• Patients requiring treatment with a receptor activator of nuclear factor kappa-B ligand (RANKL) inhibitor (e.g., denosumab) who cannot discontinue it before treatment with atezolizumab
• Treatment with any other investigational agent within 4 weeks prior to randomization
• Known clinically significant liver disease, including active viral, alcoholic, or other hepatitis; cirrhosis; fatty liver; and inherited liver disease; however,
• Patients with past or resolved hepatitis B infection (defined as having a negative hepatitis B surface antigen [HBsAg] test and a positive anti-HBc [antibody to hepatitis B core antigen] antibody test) are eligible if polymerase chain reaction (PCR) for HBV RNA is negative per local guidelines
• Patients positive for hepatitis C virus (HCV) antibody are eligible only if polymerase chain reaction (PCR) is negative for HCV ribonucleic acid (RNA) per local guidelines
• History or risk of autoimmune disease, including, but not limited to, systemic lupus erythematosus, rheumatoid arthritis, inflammatory bowel disease, vascular thrombosis associated with antiphospholipid syndrome, Wegener's granulomatosis, Sjogren's syndrome, Bell's palsy, Guillain-Barre syndrome, multiple sclerosis, autoimmune thyroid disease, vasculitis, or glomerulonephritis; however,
• Patients with a history of autoimmune hypothyroidism on a stable dose of thyroid replacement hormone may be eligible
• Patients with controlled type 1 diabetes mellitus on a stable insulin regimen may be eligible
• Patients with eczema, psoriasis, lichen simplex chronicus or vitiligo with dermatologic manifestations only (e.g., patients with psoriatic arthritis would be excluded) are permitted provided that they meet the following conditions:
• Patients with psoriasis must have a baseline ophthalmologic exam to rule out ocular manifestations
• Rash must cover less than 10% of body surface area (BSA)
• Disease is well controlled at baseline and only requiring low potency topical steroids (e.g., hydrocortisone 2.5%, hydrocortisone butyrate 0.1%, fluocinolone 0.01%, desonide 0.05%, alclometasone dipropionate 0.05%)
• No acute exacerbations of underlying condition within the last 12 months (not requiring psoralen plus ultraviolet A radiation [PUVA], methotrexate, retinoids, biologic agents, oral calcineurin inhibitors; high potency or oral steroids)
• History of idiopathic pulmonary fibrosis, pneumonitis (including drug induced), organizing pneumonia (i.e., bronchiolitis obliterans, cryptogenic organizing pneumonia, etc.), or evidence of active pneumonitis on screening chest computed tomography (CT) scan; history of radiation pneumonitis in the radiation field (fibrosis) is permitted
• History of severe allergic, anaphylactic, or other hypersensitivity reactions to chimeric or humanized antibodies or fusion proteins
• Patients with known active tuberculosis (TB) are excluded
• Severe infections within 28 days prior to randomization, including but not limited to, hospitalization for complications of infection, bacteremia, or severe pneumonia
• Signs or symptoms of infection within 14 days prior to randomization
• Received oral or intravenous (IV) antibiotics within 14 days prior to randomization; patients receiving prophylactic antibiotics (e.g., for prevention of a urinary tract infection or chronic obstructive pulmonary disease) are eligible
• Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to randomization or anticipation of need for a major surgical procedure during the course of the study
• Administration of a live, attenuated vaccine within 28 days prior to randomization or anticipation that such a live, attenuated vaccine will be required during the study and up to 5 months after the last dose of atezolizumab; Note: influenza vaccination should be given during influenza season only (approximately October to March); patients must not receive live, attenuated influenza vaccine within 28 days prior to randomization or at any time during the study
• Psychiatric illness/social situations that would limit compliance with study requirements
• Pregnant women are excluded from this study because atezolizumab is an agent with the potential for teratogenic or abortifacient effects; because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with atezolizumab, breastfeeding should be discontinued if the mother is treated with atezolizumab; these potential risks may also apply to other agents used in this study; (Note: pr

• Capable of making informed decisions regarding his/her treatment
• Have known cirrhosis or other risk factors for HCC, based on American Association for the Study of Liver Diseases (AASLD) and European Association for the Study of the Liver (EASL) guidelines (applicable in each site jurisdictions)
• Patients with untreated focal liver observations on liver ultrasound or multiphase contrast-enhanced CT or MRI performed as part of clinical standard of care within 4 weeks before patient enrollment. OR • Patients with untreated focal liver observations scheduled for follow-up multiphase contrast-enhanced CT or MRI, biopsy or surgical excision as part of clinical standard of care. CEUS should be performed within 4 weeks before or after follow-up imaging or within 4 weeks before biopsy or surgical excision.
• Patients who are pregnant or lactating
• Patients with focal liver observations less than 5 mm or greater than 5 cm in size
• Patients with contraindications to CEUS
• Patients with contraindications to both CT and MRI
• Patients who are medically unstable, terminally ill, or whose clinical course is unpredictable
• Liver nodule previously treated with trans-arterial or thermal ablation
• Patients who have received an investigational drug in the 30 days before CEUS, or will receive one within 72 hour after their CEUS exam

• Biopsy-confirmed diagnosis of primary or recurrent respective tumor type and scheduled to undergo surgical resection
• Part 1: Biopsy-confirmed diagnosis of head and neck squamous cell carcinoma (HNSCC) or breast cancer
• Part 2: Biopsy-confirmed diagnosis of HNSCC, breast cancer, colorectal cancer, prostate cancer, ovarian cancer, urothelial carcinoma and non-small cell lung cancer.
• Part 3: Stage 2 to 4 HNSCC Including T0 or Tx unknown Primary cancers
• Histologically diagnosed by an excisional biopsy procedure
• Tumors at sites of which the surgeon would assess that in vivo intraoperative imaging would not be feasible
• Life expectancy <12 weeks
• Hepatic impairment (Child-Pugh score >5) or significant liver disease including active hepatitis or cirrhosis

• STEP 1 REGISTRATION:
• If this will be the first patient from a registering site to receive a given RT modality (3DCRT vs. IMRT), the site must first submit pre-RT planning documents within 3 days of Step 1 registration and receive approval from Imaging and Radiation Oncology Core (IROC) before randomizing the patient to Step 2. If this will not be the first patient to receive a specific RT modality, the patient should be immediately randomized to Step 2 on the same day.
• STEP 2 RANDOMIZATION
• If patient required review of pre-RT planning, randomization must occur within 14 days of initial registration.
• Patients must have histologically proven, T2-T4a N0M0 urothelial carcinoma of the bladder within 120 days prior to randomization and no intervening treatment between the histologic proof and randomization. Patients with mixed urothelial carcinoma will be eligible for the trial, but the presence of small cell carcinoma will make a patient ineligible. Patients with lymph nodes >= 1.0 cm in shortest cross-sectional diameter on imaging (computed tomography [CT]/magnetic resonance imaging [MRI] of abdomen and pelvis) must have a biopsy of the enlarged lymph node showing no tumor involvement within 70 days prior to randomization. These patients may be suitable for neoadjuvant chemotherapy and radical cystectomy and are eligible for this trial if they seek out a bladder sparing treatment strategy, however patients who have received prior systemic chemotherapy for bladder cancer are not eligible for the trial.
• Patients must undergo a transurethral resection of bladder tumor (TURBT) within 70 days prior to randomization. In a situation where a patient is referred from outside to the enrolling institution, patient must have a repeat cystoscopy by the urologist who will be following the patient on the clinical trial to assess the adequacy of the prior TURBT. Patient may then undergo repeat TURBT if deemed necessary as standard of care by the treating urologist. Patients may have either completely or partially resected tumors as long as the treating urologist attempted maximal resection. Patient must not have T4b disease.
• Patients must undergo radiological staging within 70 days prior to randomization. Imaging of chest, abdomen, and pelvis must be performed using CT or MRI. Patients must not have evidence of T4bN1-3 disease. Eligibility is based on the local radiology report.
• Patients with hydronephrosis are eligible if they have unilateral hydronephrosis and kidney function meets criteria specified.
• Patient must be planning to receive one of the protocol specified chemotherapy regimens.
• All adverse events associated with any prior surgery and intravesical therapy must have resolved to Common Terminology Criteria for Adverse Events (CTCAE) grade =< 2 prior to randomization.
• Patient may or may not be radical cystectomy candidates.
• Absolute neutrophil count (ANC) >=1,500/microliter (mcL) (within 28 days prior to randomization).
• Platelets >= 100,000/mcL (within 28 days prior to randomization).
• Hemoglobin >= 9 g/dL (within 28 days prior to randomization).
• Total bilirubin =< 1.5 x institutional upper limit of normal (IULN) (except patients with Gilbert's syndrome, who must have a total bilirubin < 3.0 mg/dL) (within 28 days prior to randomization).
• Aspartate aminotransferase (AST) or alanine aminotransferase (ALT) < 2.5 x IULN (within 28 days prior to randomization).
• Patients must have adequate renal function as evidenced by calculated creatinine clearance >= 25 mL/min. The creatinine used to calculate the clearance result must have been obtained within 28 days prior to randomization.
• Patients must have Zubrod performance status =< 2.
• Patients must have a baseline electrocardiography (ECG) performed within 30 days prior to randomization.
• If patient has a known history of hepatitis B virus (HBV) or hepatitis C virus (HCV), they must meet the following criteria within 28 days prior to randomization.
• Patients with past or resolved hepatitis B infection (defined as having a negative hepatitis B surface antigen [HBsAg] test and a positive anti-HBc [antibody to hepatitis B core antigen] antibody test) are eligible.
• Patients positive for hepatitis C virus (HCV) antibody are eligible only if polymerase chain reaction (PCR) is negative for HCV ribonucleic acid (RNA).
• Patients who are known to be positive for human immunodeficiency virus (HIV) are eligible only if they have all of the following:
• A stable regimen of highly active anti-retroviral therapy (HAART)
• No requirement for concurrent antibiotics or antifungal agents for the prevention of opportunistic infections
• A CD4 count above 250 cells/mcL and an undetectable HIV viral load on standard PCR-based tests within 28 days prior to randomization.
• No other prior malignancy is allowed except for the following: adequately treated basal cell or squamous cell skin cancer, in situ cervical cancer, adequately treated Stage I or II cancer from which the patient is currently in complete remission, or any other cancer from which the patient has been disease free for two years. Patients with localized prostate cancer who are being followed by an active surveillance program are also eligible.
• Female patients of childbearing potential must have a serum pregnancy test prior to randomization. Patients must not be pregnant or nursing due to the potential teratogenic side effects of the protocol treatment. Women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, for the duration of protocol treatment, and for 5 months (150 days) after the last dose of all study drugs. A woman is considered to be of "reproductive potential" if she has had a menses at any time in the preceding 12 consecutive months.
• Patients must be offered the opportunity to participate in specimen banking for future studies.
• Patients who can complete Patient-Reported Outcome instruments in English or Spanish must agree to complete the EORTC QLQ-C30, the EORTC QLQ-BLM30, the EPIC-26 (bowel domain only), and the EQ-5D-5L per protocol schedule of assessment.
• As a part of the Oncology Patient Enrollment Network (OPEN) registration process the treating institution's identity is provided in order to ensure that the current (within 365 days) date of institutional review board approval for this study has been entered in the system.
• STEP 2 RANDOMIZATION EXCLUSION CRITERIA
• Patients must not have had urothelial carcinoma or histological variant at any site outside of the urinary bladder within the previous 24 months except Ta/T1/carcinoma in situ (CIS) of the upper urinary tract including renal pelvis and ureter if the patient had undergone complete nephroureterectomy.
• Patients must not have diffuse CIS based on cystoscopy and biopsy.
• Patient must not have received any systemic chemotherapy for their bladder cancer.
• Patient must not have had prior pelvic radiation.
• Patients must not have received prior treatment for muscle invasive bladder cancer including neoadjuvant chemotherapy for the current tumor.
• Patients must not have received any systemic therapy (including, but not limited to, interferon alfa-2b, high dose IL-2, pegylated interferon [PEG-IFN], anti-PD-1, anti-PD-L1), for non-muscle invasive bladder cancer. Prior intravesical BCG, interferon, and intravesical chemotherapy are allowed.
• Patients must not have received any of the following prohibited therapies within 28 days prior to randomization or be planning to receive any of the following prohibited therapies during protocol treatment:
• Anti-cancer systemic chemotherapy or biological therapy not specified in the protocol.
• Immunotherapy not specified in this protocol.
• Systemic or intravesical use of any non-study anti-cancer agent (investigational or non-investigational).
• Investigational agents other than atezolizumab.
• Live vaccines: Examples of live vaccines include, but are not limited to, the following: measles, mumps, rubella, chicken pox, shingles, yellow fever, rabies, bacillus Calmette-Guerin (BCG), and typhoid (oral) vaccine. Seasonal influenza vaccines for injection are generally killed virus vaccines and are allowed; however, intranasal influenza vaccines (e.g. Flu-Mist) are live attenuated vaccines, and are not allowed. Prior administration of intravesical BCG is allowed.
• Glucocorticoids for any purpose other than to modulate symptoms from an event of suspected immunologic etiology. The use of physiologic doses of corticosteroids (defined as 10 mg prednisone) are acceptable, however site investigators should consult with the study chair for any dose higher than 10 mg prednisone. Dexamethasone 4 mg iv with chemotherapy to prevent nausea is allowed.
• RANKL infusion: Concurrent denosumab (which binds the cytokine RANKL) for any known indication is prohibited due to interaction with study medication.
• Patients must not have a major surgical procedure within 28 days prior to randomization. If patient had any surgical procedure then they should have recovered to full presurgical performance status and surgical adverse events should have resolved to grade =< 2. TURBT is not considered a major surgical procedure.
• Patients must not have received treatment with systemic immunosuppressive medications (including, but not limited to, prednisone, cyclophosphamide, azathioprine, methotrexate, thalidomide, and anti-tumor necrosis factor [anti-TNF] agents) within 14 days prior to randomization. Exceptions:
• Patients may have received acute, low dose, systemic immunosuppressant medications (e.g., a one-time dose of dexamethasone for nausea).
• The use of inhaled corticosteroids and mineralocorticoids (e.g., fludrocortisone) for patients with orthostatic hypotension or adrenocortical insufficiency is allowed. Physiological doses equivalent of 10 mg prednisone daily are allowed. Short term steroids given as antiemetic therapy, e.g. 4 mg dexamethasone or equivalent once a week, is allowed.
• Patients must not have received a live, attenuated vaccine within 4 weeks prior to randomization or anticipate that such a live, attenuated vaccine will be required while on protocol treatment and up to 5 months after the last dose of protocol treatment.
• Inactivated influenza vaccination should be given during influenza season only (approximately October to March). Patients must not receive live, attenuated influenza vaccine within 4 weeks prior to randomization or while on protocol treatment and up to 5 months after the last dose of protocol treatment.
• Patients must not have undergone prior allogeneic bone marrow transplantation or prior solid organ transplantation.
• Patients must not have clinically significant liver disease that precludes patient from treatment regimens prescribed on the study (including, but not limited to, active viral, alcoholic or other autoimmune hepatitis, cirrhosis or inherited liver disease).
• Patient must not have history of idiopathic pulmonary fibrosis, pneumonitis (including drug induced), organizing pneumonia (i.e., bronchiolitis obliterans, cryptogenic organizing pneumonia, etc.), or evidence of active pneumonitis.
• Patients must not have an active infection requiring oral or IV antibiotics within 14 days prior to randomization. Patients receiving prophylactic antibiotics (e.g., for prevention of a urinary tract infection or chronic obstructive pulmonary disease) are not eligible. If patient develops urinary tract infection after TURBT they must have recovered from the infection prior to registration.
• Patients must not have active autoimmune disease that has required systemic treatment in past two years (i.e., with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Replacement therapy (e.g., thyroxine, insulin, or physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency, etc.) is not considered a form of systemic treatment. Autoimmune diseases include, but are not limited to, systemic lupus erythematosus, rheumatoid arthritis, inflammatory bowel disease, vascular thrombosis associated with antiphospholipid syndrome, Wegener's granulomatosis, Sjogren's syndrome, Bell's palsy, Guillain-Barre syndrome, multiple sclerosis, autoimmune thyroid disease, vasculitis, Graves' disease treated with methimazole or glomerulonephritis.
• Patient must not have a history of active tuberculosis.
• Patients must not be known to be allergic to Chinese hamster egg or ovary cell products and must not have any known major allergic reactions to any study drug.

Key Inclusion Criteria (Parts A & B):
• A documented diagnosis of EoE by endoscopic biopsy
• Baseline endoscopic biopsies with a demonstration on central reading of intraepithelial eosinophilic infiltration
• History (by patient report) of an average of at least 2 episodes of dysphagia (with intake of solids) per week in the 4 weeks prior to screening Key Exclusion Criteria (Parts A & B):
• Body weight ≤40 kg
• Prior participation in a dupilumab clinical trial, or past or current treatment with dupilumab
• Initiation or change of a food-elimination diet regimen or re-introduction of a previously eliminated food group in the 6 weeks prior to screening.
• Other causes of esophageal eosinophilia or the following conditions: hypereosinophilic syndrome and eosinophilic granulomatosis with polyangiitis (Churg-Strauss syndrome)
• Active Helicobacter pylori infection
• History of achalasia, Crohn's disease, ulcerative colitis, celiac disease, and prior esophageal surgery
• Any esophageal stricture unable to be passed with a standard, diagnostic, 9 to10 mm upper endoscope or any critical esophageal stricture that requires dilation at screening
• History of bleeding disorders or esophageal varices
• Pregnant or breastfeeding women, or women planning to become pregnant or breastfeed during the study Key Exclusion Criteria (Part C):
• Participants who, during Part A or Part B, developed a serious adverse event (SAE) and/or adverse event (AE) deemed related to study drug, which in the opinion of the investigator could indicate that continued treatment with study drug may present an unreasonable risk for the participant
• Participants who became pregnant during Part A or Part B
• Participants who are prematurely discontinued from study drug due to an AE (patients who are prematurely discontinued from study drug due to lack of efficacy are eligible to enter Part C)
• Patients who did not undergo endoscopy with biopsies prior to receiving rescue treatment Note: Other inclusion/ exclusion criteria apply

Key
• No evidence of extrahepatic disease
• Disease not amenable to curative surgery or transplantation or curative ablation but disease amenable to TACE
• Child-Pugh score class A to B7 and Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 at enrollment
• Measurable disease by Modified Response Criteria in Solid Tumors (mRECIST) criteria
• Adequate organ and marrow function Key Exclusion Criteria
• Any history of nephrotic or nephritic syndrome
• Clinically significant cardiovascular disease or history of arterioembolic event including a stroke or myocardial infarction
• Any prior or current evidence of coagulopathy or bleeding diathesis or patients who had any kind of surgery in the past 28 days (biopsies are exempt from this exclusion)
• History of abdominal fistula or GI perforation, non healed gastric ulcer that is refractory to treatment, or active GI bleeding within 6 months prior to enrollment
• Patients with Vp3 and Vp4 portal vein thrombosis on baseline imaging are excluded

Inclusion Criteria 1. AH, as defined by the NIAAA pan-consortia for AH6: 1. Onset of jaundice (defined as serum total bilirubin >3 mg/dL) within the prior 8 weeks to screening visit 2. Regular consumption of alcohol with an intake of > 40 gm daily or >280gm weekly on average for women and > 60 gm daily or >420gm weekly on average for men for 6 months or more, with less than 8 weeks of abstinence before onset of jaundice 3. AST > 50 IU/l 4. AST:ALT > 1.5 and both values < 400 IU/l 5. and/or histological evidence of AH* 2. MELD 20-35 on day of randomization.
• In patients with possible AH or AH with confounding factors such as possible ischemic hepatitis, possible DILI, uncertain history of alcohol use (e.g., patient denies excessive alcohol use), and atypical/abnormal laboratory tests (e.g., AST < 50 IU/L or > 400 IU/L, AST/ALT ratio < 1.5), antinuclear antibody > 1:160 or SMA > 1:80, a standard of care liver biopsy may be performed during current hospital admission to confirm AH and exclude competing etiologies 17 Exclusion Criteria 1. MELD SCORE <20 or > 35 2. Active sepsis (positive blood or ascitic cultures) with Systemic Inflammatory Response Syndrome (SIRS) or hemodynamic compromise requiring intravenous pressors to maintain tissue perfusion 3. Pneumonia as evidenced by radiological exam 4. Multi-organ failure 5. Renal failure defined by GFR <50 mL/min. 6. Clinically active C. diff infection 7. History of imaging of the liver (ultrasound, computerized tomography or magnetic resonance) showing other causes of jaundice 8. History of other liver diseases including hepatitis B (positive HBsAg or HBV DNA), hepatitis C (positive HCV RNA), autoimmune hepatitis, Wilson disease, genetic \hemochromatosis, alpha1-antitrypsin deficiency or strong suspicion of Drug Induced Liver Injury (DILI) 9. History of HIV infection (positive HIV RNA or on treatment for HIV infection) 10. History or presence of cancer (including hepatocellular carcinoma) other than non- melanoma skin cancer 11. History of other significant medical problems such as autoimmune diseases, severe asthma, psoriasis, Inflammatory Bowel Disease (IBD), etc. that might require immunosuppressive treatments 12. Pregnancy or breastfeeding 13. Prior exposure to experimental therapies in last 3 months 14. Prior exposure to systemic corticosteroid (glucocorticoid) or immunosuppressive therapy for more than 4 days within previous 30 days 15. Need for inotropic pressor support to maintain perfusion to critical organs within prior 48 hours before randomization and initiation of experimental treatment 16. Clinically significant pancreatitis- abdominal pain, elevated lipase (> 3 X ULN) and at least edema of pancreas with fat-stranding on CT scan 17. Total WBC count > 30,000/mm3 18. Known allergy or intolerance to therapeutic agents to be tested 19. Inability to voluntarily obtain informed consent from participant or guardian 20. Perceived inability to follow study procedures and comply with protocol 21. Platelet count < 50,000 k/cumm. 22. Positive PCR test for COVID -19 within 7 days prior to the baseline day 0 visit *Positive test is exclusionary only during screening period. If a patient tests positive any time after baseline randomization, a positive PCR test for COVID-19 will be considered as a SAE.

• Pediatric patients ages 10-18
• Clinical diagnosis of Inflammatory Bowel Disease (Crohn's Disease or Ulcerative Colitis)
• Undergoing elective gastrointestinal/colorectal surgical procedures
• Children undergoing emergent/urgent gastrointestinal/colorectal surgical procedures
• Patients/families who cannot read and write English or Spanish

• Enrolled in & completed the baseline evaluation in NCT01263600 OR completed necessary components of NCT01263600 baseline evaluation by the end of the baseline visit.
• 3 to <18 years at time of randomization (day 0).
• Documented chronic HBV infection as evidenced by detection of HBsAg in serum for ≥ 24 weeks prior to baseline OR positive HBsAg and negative anti-HBc IgM within 24 weeks of baseline visit.
• Presence of HBeAg in serum at the last screening visit within 6 weeks of baseline visit.
• Serum HBV DNA level >10^7 IU/mL on at least 2 occasions at least 12 weeks apart during the 52 weeks before baseline visit. The HBV DNA levels must be within 6 weeks of baseline visit.
• ALT ≤60 U/l in males or ≤40 U/l in females, measured on at least 2 occasions, at screening (within 6 weeks prior to baseline visit) & at least 12 weeks prior to the screening visit & within the 52 weeks prior to baseline visit.
• Compensated liver disease, with normal total bilirubin (except if Gilbert's syndrome), direct bilirubin ≤0.5 mg/dL, INR ≤1.5, and serum albumin ≥3.5 g/dL.
• Creatinine clearance 90 ml/min.
• Absence of hepatocellular carcinoma on liver ultrasound in the past 48 weeks. Exclusion criteria:
• Presence of infection with HCV-RNA or anti-HCV, anti-HDV, or HIV at screening.
• Presence of another cause of liver disease or HCC (serum alpha-fetoprotein >50ng /ml).
• Evidence of decompensated liver disease (Childs B-C).
• History or other evidence of a medical condition associated with chronic liver disease (e.g., hemochromatosis, autoimmune hepatitis, alcoholic liver disease, toxin exposures).
• Females who are pregnant or breastfeeding.
• Adolescent females unwilling or unable to use an acceptable method of contraception if sexually active during the treatment period.
• Children currently breastfeeding while their mother is taking lamivudine, or those who were exposed to lamivudine for ≥24 weeks via maternal lamivudine treatment during pregnancy and/or while breastfeeding.
• Previous liver or other organ transplantation including engrafted bone marrow transplant.
• Hematological abnormalities during the screening period that contraindicate full dosing with study drugs, e.g absolute neutrophil count < 1.5 x 10^9 cells/L or platelet count < 120 x 10^9 cells/L.
• Known allergy to study drugs; peginterferon alfa-2a or entecavir.
• Treatment with systemic acyclovir or famciclovir within the previous 6 months.
• Need for ongoing use of any antivirals with activity against HBV during the course of the study or history of receiving treatment for HBV.
• Any use of illegal drugs OR use of alcoholic beverages which in the opinion of a study physician is sufficient to prevent adequate compliance with study procedures or increase the risk of pancreatitis or hepatotoxicity.
• History of immunologically mediated disease (e.g. inflammatory bowel disease, idiopathic thrombocytopenic purpura, lupus erythematosus, autoimmune haemolytic anemia, scleroderma, severe psoriasis, rheumatoid arthritis).
• History or other evidence of bleeding from esophageal varices or consistent with decompensated liver disease.
• History or other evidence of chronic pulmonary disease associated with functional limitation.
• History of significant cardiovascular diseases.
• History of a severe seizure disorder or current anticonvulsant use.
• History or other evidence of severe retinopathy.
• History of thyroid disease poorly controlled on prescribed medications. Participants with elevated thyroid stimulating hormone concentrations with elevation of antibodies to thyroid peroxidase and any clinical manifestations of thyroid disease are excluded.
• Concomitant use or use during ≤ 6 months prior to the first dose of study drug of anti-neoplastic, immunosuppressive, nephrotoxic or hepatotoxic medication, methadone, theophylline or medications that may affect renal excretion or hepatic metabolism are not permitted.
• Concomitant use of complementary or alternative medications purported to have antiviral activity.
• A participant may not be co-enrolled in another clinical trial where an investigational drug is administered.
• Any other condition or situation that in the opinion of a study physician would make the participant unsuitable for enrollment or could interfere with the participant participating in and completing the study.

1. Adults and children (age 2 or older) being managed or treated for nonalcoholic fatty liver disease. Diagnosis is based on the clinical judgement of the care provider. 1. Inability to provide written informed assent/consent 2. Simultaneous enrollment in another registry, study, or clinical trial where NASH treatment outcomes are reported, except where approved or conducted as an adjunct project of TARGET-NASH. If a participant elects to enroll in an interventional clinical trial during their enrollment in TARGET-NASH, records submissions for the participant will be put 'on hold' for the trial duration. When participation in the trial is complete, records submissions for TARGET-NASH will resume.

• Adult patients (age 18 or older) being treated or managed for PBC
• Inability to provide written informed consent
• Simultaneous enrollment in another prospective registry or clinical trial or study where PBC treatment outcomes are reported, except where approved or conducted as an adjunct project of TARGET-PBC

• Subjects aged 1 to 16 years who in the judgment of the investigator are candidates for gastric acid suppression therapy (ie, those with a presumptive diagnosis of GERD, a clinical diagnosis of suspected GERD, symptomatic GERD, or endoscopically proven GERD) and whom the investigator judges would need to receive IV PPI therapy for at least 4 days.
• Body weight > 5th percentile for age.
• Y-site or dedicated IV line for administration of pantoprazole sodium.
• Expected survival for at least 30 days.
• Fertile male and female subjects of childbearing potential at risk for pregnancy must agree to use a highly effective method of contraception throughout the study and for at least 28 days after the last dose of assigned treatment. Female subjects of non-childbearing potential must be premenarchal, have undergone hysterectomy with bilateral oophorectomy, have medically confirmed ovarian failure, or achieved post-menopausal status.
• Participation in other studies involving investigational drug(s) or treatment with an investigational drug within 30 days or 5 half lives prior to study entry and/or during study participation.
• Other severe acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with study participation or investigational product administration or may interfere with the interpretation of study results and, in the judgment of the investigator, would make the subject inappropriate for entry into this study.
• Pregnant females; breastfeeding females; fertile male subjects, and female subjects of childbearing potential who are unwilling or unable to use a highly effective method of contraception for the duration of the study and for at least 28 days after last dose of investigational product.
• Serum CK levels >3x ULN.
• Known history of HIV or clinical manifestations of AIDS.
• Known hypersensitivity to PPIs or to any substituted benzimidazole or to any of the excipients.
• History of treatment with any PPI within 2 days (48 hours) before investigational product dosing on Day 1.
• Use of H2RAs, sucralfate, misoprostol, or prokinetic agents, and bismuth preparations within 1 day (24 hours) before investigational product dosing on Day 1.
• Any disorder requiring chronic (every day) use of warfarin, carbamazepine, or phenytoin, methotrexate, atazanavir or nelfinavir, clopidogrel, and potent inhibitors and inducers of CYP2C19.
• Chronic (daily) use of glucocorticoids. Steroid inhalers and topical steroids may be used.
• Active malignancy of any type, or history of a malignancy (Subject with a history of malignancies that have been surgically removed or eradicated by irradiation or chemotherapy and who have no evidence of recurrence for at least 5 years before Screening are acceptable).
• ALT or BUN >2.0 ULN or estimated creatinine >1.5 X ULN for age or any other laboratory abnormality considered by the Investigator to be clinically significant within 14 days before Screening.
• In the Investigator's opinion, a chronic condition (eg, diabetes, epilepsy), which is either not stable or well controlled and may interfere with the conduct of the study.
• History of sensitivity to heparin or heparin induced thrombocytopenia.

• Ages 18 to 99 years.
• All races, ethnicities and gender identification may be included. Subjects must meet all of the inclusion and exclusion criteria to be included in the study.
• Either fatty liver diagnosis (defined as >5.6% fat content in the liver) or healthy control
• While all races and ethnicities will be included, subjects must be able to read and speak the English language. Once the protocol is established, Spanish-speaking participants will be included.
• Women of child-bearing potential must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, for the duration of study participation. Should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately. Fatty Liver Subjects
• No subjects taking hypoglycemic agents or insulin will be enrolled. There is no exclusion based on fasting glucose.
• Subjects with major mental health conditions such as schizophrenia and bipolar disorder that would limit compliance with study requirements will not participate. In general, subjects with any form of medical instability such as seizure disorders, significant COPD, significant asthma, left ventricular dysfunction will not participate.
• Medications for control of hypercholesterolemia, hypertriglyceridemia or hyperglycemia. Healthy Control Subjects
• Liver disease or other chronic illness
• Diagnosis of type I or type II diabetes
• No subjects taking hypoglycemic agents or insulin will be enrolled. There is no exclusion based on fasting glucose.
• A potential subject with any major medical, surgical or psychiatric condition will not participate. These conditions include but are not limited to thyroid disease, chronic metabolic illness, known vascular disease, current cancer diagnosis and/or treatment.
• Subjects with major mental health conditions such as schizophrenia and bipolar disorder that would limit compliance with study requirements will not participate. In general, subjects with any form of medical instability such as seizure disorders, significant COPD, significant asthma, left ventricular dysfunction will not participate.
• Medications for control of hypercholesterolemia, hypertriglyceridemia or hyperglycemia. All Subjects
• No prior hepato-biliary surgery.
• Donated blood within the prior 4 weeks.
• Consume more than 10 grams of ethanol per day.
• Cirrhosis or any form of viral hepatitis.
• Prior documented hepatic reaction to drugs with a known hepatotoxicity profile such as isoniazid, methotrexate, phenytoin, propylthiouracil, valproate, etc.
• Pregnant/Lactating
• Receiving any other investigational agents.
• Any contraindication noted on the UTSWMC MRI Screening Form including implants contraindicated at 3T, pacemakers, Implantable Cardioverter Defibrillators (ICD), etc., and significant claustrophobia.

ALF
• Written Informed consent from patient's next of kin
• Altered mentation of any degree (encephalopathy)
• Evidence of moderately severe coagulopathy (INR ≥ 1.5)
• A presumed acute illness onset of less than 26 weeks
• The NIH guidelines on the inclusion of women and minorities as subjects in clinical research will be observed ALF
• Cirrhosis patients
• Alcohol induced liver failure
• Known pre-existing chronic liver disease ALI Acetaminophen (APAP) etiology: acute illness < 2 wks
• INR ≥ 2.0, ALT ≥ 10X ULN Non-acetaminophen etiology: acute illness < 26 wks
• INR≥ 2.0, ALT≥ 10X ULN, TBili ≥ 3 mg/dl ALI • Altered mentation of any degree (encephalopathy)

Subjects should meet all of the following inclusion criteria: 1. Male or female age > / = 12 years. 2. Recipient of a solid organ or hematopoietic stem cell transplant. 3. Positive test result for Norovirus within 14 days of enrollment that is obtained as part of routine clinical care using a Norovirus testing available to the site. 4. Active GI symptoms (diarrhea, or vomiting) that, in the opinion of the PI, are secondary to Norovirus. Patients must have active diarrhea, which is defined as at least 3 days of Bristol 6 or 7 stools in the past 2 weeks prior to enrollment per patient report. 5. Willing and able to provide written informed consent and assent before initiation of any study procedures, consistent with local IRB policy. 6. Subjects must be of non-childbearing potential or if of childbearing potential, must be using an effective method of birth control or must be abstinent.
• Non-childbearing potential is defined as surgically sterile or postmenopausal for > one year.
• Effective methods of birth control include the use of hormonal or barrier birth control such as implants, injectable contraceptives, combined oral contraceptives, intrauterine devices (IUDs),or condoms with spermicidal agents during study period. Female subjects must be using an effective method of birth control or practice abstinence and must agree to continue such precautions during the study and for 30 days after the Day 28 study visit.
• A woman is eligible if she is monogamous with a vasectomized male.This subject is considered low risk and not required to use contraception. 7. Agrees to complete all screening requirements, study visits and procedures. Subjects meeting any of the exclusion criteria at baseline will be excluded from study participation: 1. Other identified infectious causes of diarrhea at screening. Alternative diagnosis requiring treatment would be considered a co-infection; if the testing is positive for a pathogen that the PI does not feel is causing the symptoms, they may be included but the PI or his/her designee must document that the positive test is not clinically significant, does not require treatment and is not causing the symptoms making the patient eligible for enrollment. 2. Any condition that would, in opinion of the Site Investigator, place the subject at an unacceptable risk of injury or render the subject unable to meet the requirements of the protocol. 3. Subjects receiving oral or intravenous immunoglobulin therapy concurrently or in the 14 days prior to enrollment. 4. Nitazoxanide use for any illness in the previous 30 days prior to randomization. 5. Have received experimental products within 30 days prior to the study entry or plan to receive experimental products at any time during the study 6. Known sensitivity to nitazoxanide or any of the excipients comprising the nitazoxanide tablets. 7. Subjects unable to swallow oral medications. 8. Subjects with ostomy. 9. Women who are pregnant or lactating or have a positive urine pregnancy test at screening/enrollment/Day 1.

• Must either be currently receiving treatment with, or have a history of having failed to respond to, or have a medical contraindication to at least 1 of the following therapies: oral or intravenous corticosteroids, 6-mercaptopurine, methotrexate or azathioprine OR must either have or have had a history of corticosteroid dependency (that is an inability to successfully taper corticosteroids without a return of the symptoms of ulcerative colitis [UC]) OR required more than 3 courses of corticosteroids in the past year
• Moderately to severely active UC (as defined by baseline Mayo score of 6 through 12 [endoscopy {sigmoidoscopy or colonoscopy} sub score assigned by local endoscopist], inclusive), including a (sigmoidoscopy or colonoscopy) sub score greater than or equal to (>=2)
• If receiving enteral nutrition, must have been on a stable regimen for at least 2 weeks prior to the first administration of study intervention at Week 0. Participants who receive parenteral nutrition are not permitted to enroll in the trial
• No history of latent or active tuberculosis prior to screening
• Must be up to date with all immunizations (that is, measles, mumps, rubella, and varicella) in agreement with current local immunization guidelines for immunosuppressed participants before Week 0
• History of liver or renal insufficiency; significant cardiac, vascular, pulmonary, gastrointestinal, endocrine, neurologic, hematologic, rheumatologic, psychiatric (including suicidality), or metabolic disturbances
• History of malignancy or macrophage activation syndrome or hemophagocytic lymphohistiocytosis
• Have UC limited to the rectum only or to <20 percent (%) of the colon
• Presence of a stoma
• Presence or history of a fistula
• Contraindications to the use of golimumab or infliximab or anti-tumor necrosis factor (TNF-alpha) therapy per local prescribing information

CASES: Heavy drinkers with alcoholic hepatitis Inclusion criteria 1. A clinical diagnosis of alcoholic hepatitis 2. Serum total bilirubin >3 mg/dL 3. Subject or guardian ability to understand and willingness to provide written consent 4. Age greater or equal to 21 years 5. Re-enrolment of an alcoholic hepatitis donor is permissible up to 4 times if the donor presents with a new episode of alcoholic hepatitis 24 weeks or longer after the most recent enrolment in the study Exclusion criteria 1. Liver disease significantly caused by hemochromatosis, autoimmune liver disease, Wilson disease, NAFLD, and acute viral hepatitis 2. (NOTE: The presence of chronic hepatitis C, hepatitis B, or HIV is not exclusion to participation.)Pregnant or breast feeding Based on the judgment of the investigator, subject is not capable of understanding or complying with the study requirements. CONTROLS: Heavy drinkers without significant liver disease Inclusion criteria 1. History of chronic alcohol consumption sufficient to cause liver damage. Generally, this is considered to be >40 g/day or >280g/week on average for women and >60 g/day or >420 g/week on average for men, for many years (usually decades). Judgement about chronic alcohol consumption will be made by the site investigator. 2. Subject or guardian ability to understand and willingness to provide written consent 3. Age greater or equal to 21 years Exclusion criteria 1. Past evidence of alcoholic liver disease, defined as a bilirubin > 2.0 mg/dL, an AST > 1.5 ULN, and any hospital admission for liver disease, or the presence of esophageal varices or ascites (at any time in the past). 2. Liver disease significantly caused by hemochromatosis, autoimmune liver disease, Wilson disease, NAFLD, and acute viral hepatitis (NOTE: The presence of chronic hepatitis C, hepatitis B, or HIV is not exclusion to participation.) 3. Alcohol intake at less than 40 g/day or 280g/week on average for women and 60 g/day or 420 g/week on average for men for longer than the past 28 days 4. If liver stiffness has been assessed within the prior 90 days, then stiffness suggesting fibrosis of F1 or greater is excluded. For Fibroscan, this is a fibrosis score >7.0 kPa. 5. Pregnant or breast feeding 6. Any of the following laboratory abnormalities within 90 days prior to signing the consent. 1. Total bilirubin: >ULN* 2. INR: > 1.4 5 *Individuals with a diagnosis of Gilbert's can have total bilirubin up to 3.0 mg/dL and still be eligible for participation. Healthy Controls Inclusion criteria 1. AUDIT-C scores of <4 for men and <3 for women (signifying no alcohol misuse) 2. Abstinent (consumption of less than one standard drink/week) during the 6 months prior to enrolment 3. Ability to understand and willingness to provide written consent. Exclusion criteria 1. Clinical history or laboratory evidence of liver disease including alcoholic liver disease, NAFLD, hemochromatosis, alcoholic hepatitis, autoimmune liver disease, Wilson disease, hepatitis C, or hepatitis B. 2. Presence of diabetes (requiring treatment with oral agents or insulin). 3. Significant heart disease (prior history of heart disease, other than hypertension) 4. Chronic lung disease (requiring chronic treatment) 5. Immune related conditions (such as Crohn's disease, rheumatoid arthritis, ulcerative colitis, systemic lupus erythematosus, severe psoriasis, etc.) 6. Known infection with HIV 7. Presumed infection, or use of antibiotics or other medications (e.g., corticosteroids) that would affect immune function, within the past 14 days 8. BMI>35 9. Current or known history of cancer (except in situ carcinoma of the cervix or adequately treated basal or squamous cell carcinoma of the skin) within 5 years prior to enrollment 10. Pregnant or breast feeding 11. Any of the following laboratory abnormalities within 90 days prior to signing the consent. 1. Hemoglobin: <10 g/dL 2. Conjugated bilirubin: > ULN 3. INR: > 1.4 4. AST: >40 IU/mL 5. ALT: >40 IU/mL 12. Based on the judgment of the investigator, subject is not capable of complying with the study requirements

1. Ability to provide informed consent by subject or appropriate family member 2. Age between 21-70 years 3. Recent alcohol consumption > 50 g/d for > 6 months, continuing within two months before enrollment 4. At least 2 of the following symptoms or signs of acute alcoholic hepatitis: Anorexia, nausea, RUQ pain, jaundice, leukocytosis, hepatomegaly AND 5. Elevation of AST > 80 U/L, but < 500 U/L at the time of admission or within 3 days of baseline visit; AST > ALT and ALT < 200 U/L; total bilirubin > 3 mg/dL AND 6. Liver biopsy showing alcoholic hepatitis (steatohepatitis) OR ultrasound of liver showing increased echogenicity OR CT scan showing decreased attenuation of liver compared to spleen OR MRI showing fatty liver (decreased signaling intensity on T1 weighted images). If the liver biopsy (done within 60 days of inclusion) confirms diagnosis of AAH then inclusion e will be waived. 7. Model for End-Stage Liver Disease (MELD) <20 8. Willingness to utilize two reliable forms of contraception (both males and females of childbearing potential) from screening through the first six weeks of study. 1. Hypotension with BP < 80/50 after volume repletion 2. Pregnancy; incarceration; inability to provide consent or lack of appropriate family member 3. Signs of systemic infection: Fever > 38o C and positive blood or ascites cultures on appropriate antibiotic therapy for > 3 days within 3 days of inclusion 4. Acute gastrointestinal bleeding requiring > 2 units blood transfusion within the previous 4 days 5. Undue risk from immunosuppression: Positive HBsAg; a positive skin PPD skin test or history of treatment for tuberculosis; history of any malignancy including hepatocellular carcinoma; known HIV infection 6. Treatment with corticosteroids or other immunosuppressive medications including specific anti-TNF therapy (not including pentoxifylline), calcineurin inhibitors for > 3 days within the previous 3 months. 7. Evidence of acute pancreatitis: CT evidence and/or amylase or lipase > 5 X upper limit of normal 8. Serious cardiac, respiratory or neurologic disease or evidence of autoimmune hepatitis, primary biliary cirrhosis, primary sclerosing cholangitis, Wilsons disease, hemochromatosis, secondary iron overload due to chronic hemolysis, alpha-1-antitrypsin deficiency 9. Acute or chronic kidney injury with serum creatinine > 3.0 mg/dl

1. Adult men or women (18-80 years of age) 2. Severe acute liver injury not related to acetaminophen overdose: INR ≥2.0; no evidence of HE 3. Acute liver failure: INR ≥1.5; presence of any degree of HE 4. Duration of illness <26 weeks 5. Enrolled into the ALFSG Registry. 6. Written informed consent from the patient or patient's legally authorized representative or family member as defined in the Federal Register Number 21 Congressional Federal Register (CFR)50.3(m) 1. Evidence of pre-existing chronic liver disease 2. Pre-existing New York Heart Association stage III/IV heart failure 3. Evidence of pre-existing chronic renal failure 4. Chronic hemodialysis prior to hospital admission 5. Evidence of cirrhosis (unless clinically acute Wilson disease or autoimmune non-APAP ALI or ALF) 6. Severe obstructive lung disease (FEV1 <50% of predicted on previous spirometry) 7. Severe shock, defined as mean arterial pressure (MAP) <70 mmHg despite >15 µg/kg/min dopamine, >0.1 µg/kg/min epinephrine, or >0.1 norepinephrine µg/kg/min 8. Extensive small bowel resection (>50 cm) 9. Any evidence of upper GI bleeding at enrollment requiring intervention (endoscopy or red blood cell (RBC) transfusion specifically for upper GI bleeding) 10. Liver transplantation (LT) prior to enrollment. (Note: Listing for LT does not preclude participation in the trial.) 11. Pregnancy or breastfeeding women (Note: Pregnancy related non-APAP ALI or ALF may be considered for entry following the delivery of the baby and assuming the mother does not wish to breastfeed or collect breast milk during the study period.) 12. Allergic to acetaminophen (such as Tylenol® or any other acetaminophen-containing medications) 13. Participation in other clinical studies evaluating other experimental treatments or procedures. (Note: Participation in observatory studies is not an exclusion.) 14. Patients in whom enteral drugs or fluids are contra-indicated or the patient either does not have an appropriately placed naso-enteric/orogastric tube in situ or cannot tolerate taking the drug preparation orally (200 ml) 15. Budd-Chiari Syndrome 16. Non-APAP ALI or ALF caused by malignancy 17. Moderate and severe adult respiratory distress syndrome (ARDS), as defined by Berlin Criteria. 18. Subjects who have received amiodarone in the 30 days prior to study enrollment 19. Consumption of any food or beverage that contains caffeine in the 24 hours prior to enrollment 20. Consumption of any of the following drugs that may interfere with the metabolism of 13C-Methacetin in the 48 hours prior to study enrollment including: allopurinol, carbamazepine, cimetidine, ciprofloxacin, daidzein, disulfiram, Echinacea, enoxacin, fluvoxamine, methoxsalen, mexiletine, montelukast, norfloxacin, phenylpropanolamine, phenytoin, propafenone, rifampin, terbinafine, ticlopidine, thiabendazole, verapamil, zileuton or oral contraceptives 21. Consumption of alcohol in the 24 hours prior to enrollment 22. Smoking cigarettes in the 8 hours prior to enrollment.

• Severe liver disease defined as known liver disease plus at least one of the following: serum albumin less than 3.0 g/dL or INR more than 2.0.
• Portal systemic encephalopathy
• Pregnancy or breastfeeding.
• Anemia (hematocrit < 32%)
• Significant weight loss or use of diet pills within previous 6 months.
• Cannot give informed consent, understand the protocol, or tolerate any aspect of the protocol.

• Women ≥ 18 years of age
• FI symptoms ≥ 3 months
• Baseline St. Mark's score of ≥ 12
• Attended ≥ 2 supervised PMT for ABL
• Intolerance, unwillingness, or inadequate response to constipating medications
• Current negative colon cancer screening based on the USPSTF's recommendation for colorectal cancer screening (2016)
• Previous PTNS treatment
• History of uncontrolled diarrhea in the past 3 months (usual or most common stool type over the preceding 3 months of 7 on the Bristol Stool Form Scale)
• History of severe constipation in the past 3 months (usual or most common stool type over the preceding 3 months of 1 on the Bristol Stool Form Scale)
• History of inflammatory bowel disease (includes Crohn's disease and ulcerative colitis, but does not include irritable bowel disease)
• Unrepaired rectovaginal fistula/chronic 4th degree laceration
• Full thickness rectal prolapse
• History of congenital anorectal malformation
• History of bowel resection surgery for any indication
• Minor anal procedures within 6 months for treatment of ABL (injection of bulking agent or radiofrequency energy) or ligation of hemorrhoids
• Prior pelvic or abdominal radiation
• Diagnosis of cancer of the descending colon or anus
• Diagnosis of cancer in the region where the PTNS or sham needles or surface electrodes would be placed
• Pacemaker, implantable defibrillator
• Current use of Interstim sacral nerve stimulator or TENS in the pelvic region, back, or legs
• Clinically significant neurological disorders known to affect anal continence
• Coagulopathy
• Severe peripheral edema preventing accurate placement of PTNS needles
• Chronic swollen, infected, inflamed skin or skin eruptions (e.g., phlebitis, thrombophlebitis, varicose veins) in the region where the PTNS or sham needles or surface electrodes would be placed
• Metal implant in foot/toes near TENS electrode location
• Marked sensory deficit (numbness) of feet or ankles in the region where the PTNS or sham needles or surface electrodes would be placed
• Childbirth within the last 3 months
• Pregnant or planning to become pregnant during the study duration 1 year; a urine pregnancy test will be performed and must be negative by the first intervention visit if the participant is of childbearing potential
• Unwilling to use acceptable form of contraceptive if the participant is of childbearing potential
• Participation in another intervention trial impacting bowel function
• Inability to provide informed consent, complete questionnaires independently, or to attend intervention sessions
• Unable or unwilling to complete the bowel diary in Run-In Phase (valid diary defined as data from ≥ 10 of 14 days with minimum of 3 consecutive days per week)
• Unwilling to download bowel diary app onto smartphone if the participant owns a smartphone
• Visual impairment prohibiting reading the paper diary, the smart phone screen
• Unable to speak, read, or write in English or Spanish at a basic level