Inclusion Criteria:

1. Male or female patients, age ≥18 years 2. Patients with a histological/cytological or radiological diagnosis of HCC (mixed HCC cholangiocarcinoma may be included; patients who are candidates for surgical and non-surgical treatment, as well as those being followed without specific HCC therapy may be included)

Exclusion Criteria:

1. Inability to provide written informed consent

Inclusion Criteria:

1. Histologically confirmed carcinoma of a primary tumor site and stage indicated in Table 3 of the protocol. 2. Tumor with HPV16 genotype as determined by testing performed in a Clinical Laboratory Improvement Amendments (CLIA) certified laboratory. 3. HLA-A*02:01 allele determined by testing performed in a CLIA certified laboratory. Participants may be enrolled based on low resolution typing (i.e., HLA-A*02) but the HLA-A*02:01 allele type must be confirmed prior to apheresis. 4. Measurable disease per RECIST Criteria Version 1.1 or PERCIST. 5. Age > 18 years. 6. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 at screening. 7. Negative pregnancy test for women under 55 and all women who have had a menstrual period in the last 12 months. A pregnancy tests is not required for women who have had a bilateral oophorectomy or hysterectomy. 8. Men and women of child-bearing potential must agree to use adequate contraception (i.e., intrauterine device, hormonal barrier method of birth control; abstinence; tubal ligation or vasectomy) prior to study entry and for four months after treatment. Should a women become pregnant or suspect she is pregnant while she is participating in this study, she should inform her treating physician immediately. 9. Seronegative for HIV antibody, hepatitis B surface antigen (sAg), and hepatitis C antibody. If a hepatitis C antibody test is positive, then testing for antigen by reverse transcription polymerase chain reaction (RT-PCR) must be negative. 10. Participants must have organ and marrow function as defined below: 1. Leukocytes > 3,000/Mantle cell lymphoma (mcL) 2. Absolute neutrophil count > 1,500/mcL 3. Platelets > 100,000/mcL 4. Hemoglobin > 9.0 g/dL 5. Total bilirubin within normal institutional limits except in participants with Gilbert's Syndrome who must have a total bilirubin < 3.0 mg/dL. 6. Serum aspartate aminotransferase (AST) (SGOT)/ alanine transaminase (ALT)(SGPT) < 2.5 x upper limit of normal (ULN) 7. Calculated creatinine clearance (CrCl) >50 mL/min/1.73 m2for participants with creatinine levels above institutional normal (by the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation). 8. international normalized ratio (INR) or activated partial thromboplastin time ( aPTT) ≤1.5 X ULN unless the subject is receiving anticoagulant therapy. Subjects on anticoagulant therapy must have a PT or aPTT within therapeutic range and no history of severe hemorrhage. 11. Participants must be able to understand and be willing to sign the written informed consent document. 12. Participants must agree to participate in protocol CINJ 192103 (Pro2021002307) for gene therapy long term follow up and in protocol Cancer Institute of New Jersey (CINJ) 192002 (Pro2021000281) for biospecimen collection study.Note: Patients may have undergone minor surgical procedures with the past three weeks, aslong as all toxicities have recovered to Grade 1 or less.

Exclusion Criteria: Subjects who meet any of the following criteria will be excluded from

participation in this study: 1. Prior systemic therapy or definitive chemoradiation for the cancer that is being treated on this protocol. 2. Current treatment with another investigational agent. 3. History of severe allergic reactions to compounds of similar chemical or biological composition to agents used in this study. 4. Uncontrolled intercurrent illness such as active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations at the time of treatment that would limit compliance with study requirements. 5. Subjects with HLA-A*02:01 damaging mutation or allele loss or other molecular resistance detected by research or clinical sequencing will not be eligible. 6. Documented LVEF of less than or equal to 45% tested. The following participants will undergo cardiac evaluations: 1. Clinically significant atrial and/or ventricular arrhythmias including but not limited to: atrial fibrillation, ventricular tachycardia, second or third degree heart block or 2. Age > 50 years old 7. Participants with baseline screening pulse oxygen level of <92% on room air will not be eligible. If the underlying cause of hypoxia improves, they may be reevaluated. 8. Because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with E7 TCR T cells, breastfeeding should be discontinued if the mother is treated with E7 TCR T cells. These potential risks may also apply to other agents used in this study. 9. Participants with a systemic immunodeficiency including acquired deficiency such as HIV or primary immunodeficiency such as Severe Combined Immunodeficiency Disease are ineligible. The experimental treatment being evaluated in this protocol depends on an intact immune system. Participants who have decreased immune competence may be less responsive to the treatment. 10. Participants on immunosuppressive drugs including corticosteroids unless meeting criteria outlined in Section 6.1 (Prohibited Medications). 11. Participants with potentially severe autoimmune diseases such as Crohn's disease, ulcerative colitis, rheumatoid arthritis, autoimmune hepatitis, autoimmune pancreatitis, or systemic lupus erythematosus are not eligible. Patients with less severe autoimmune diseases such as hypothyroidism, vitiligo, and other minor autoimmune disorders are eligible. 12. Participants with prior or concurrent malignancy whose natural history or treatment is unlikely to interfere with the safety or efficacy assessments of the investigational regimen are eligible for this trial. Examples include, but are not limited to: 1. Carcinoma in situ 2. Cutaneous skin cancers requiring only local excision 3. Low grade non-muscle invasive bladder cancer 4. Low grade prostate cancer 13. Subjects who received a live vaccine within 30 days prior to enrollment are not eligible. 14. Determination by the Principal Investigator that participation is not in the best interest of the research subject or may jeopardize the safety of the subject or integrity of the clinical trial data.

Inclusion Criteria:

• Patients must have pathologically confirmed pancreatic adenocarcinoma
• Received 4-6 months of induction chemotherapy with fluorouracil, irinotecan, leucovorin and oxaliplatin (FOLFIRINOX), fluorouracil, liposomal irinotecan, luecovorin, oxaliplatin (NALIRIFOX), or gemcitabine/Abraxane, as per standard of care
• Patients must have locally advanced pancreatic cancer according to National Comprehensive Cancer Network (NCCN) Guidelines (version 1.2020) on pancreas protocol CT scan performed within 21 days of registration. Locally advanced disease is defined as any of the following:
• For head or uncinate process tumors:
• Solid tumor contact with superior mesenteric artery > 180 degrees
• Solid tumor contact with the celiac axis > 180 degrees
• Solid tumor contact with the common or proper hepatic arteries > 180 degrees or
• For pancreatic body or tail tumors:
• Solid tumor contact of > 180 degrees with the superior mesenteric artery or celiac axis
• Solid tumor contact with the celiac axis and aortic involvement or
• Unreconstructible superior mesenteric vein or portal vein due to tumor involvement or occlusion (can be due to tumor or bland thrombus)
• The determination of locally advanced pancreatic cancer and plan for non-operative treatment on this clinical trial must be confirmed through local multi-disciplinary review
• Measurable disease per response evaluation criteria in solid tumors (RECIST) version (v)1.1
• Age >= 18 years. Because no dosing or adverse event data are currently available on the use of M3814 (peposertib) in combination with hypofractionated radiation in patients < 18 years of age, children are excluded from this study, but will be eligible for future pediatric trials
• Eastern Cooperative Oncology Group (ECOG) performance status =< 2 (Karnofsky >= 60%)
• Leukocytes >= 4,000/mcL
• Absolute neutrophil count >= 1.5 x 10^9/L.
• Hemoglobin >= 9 g/dL
• Platelets >= 100 x 10^9/L
• Total bilirubin =< 2.0 x institutional upper limit of normal (ULN)
• Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamic pyruvic transaminase [SGPT]) =< 3 x institutional ULN
• Creatinine =< 1.5 x institutional ULN
• Glomerular filtration rate (GFR) >= 51 mL/min/1.73 m^2
• Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial
• 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
• Female patients of childbearing potential must have a negative urine or serum pregnancy test within 72 hours prior to receiving the first dose of study medication. If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required. Female patients of childbearing potential and male patients must be willing to use an adequate method of contraception for the course of the study through 12 weeks after the last dose of study medication.
• Note: Abstinence is acceptable if this is the usual lifestyle and preferred contraception for the patient.
• 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. To be eligible for this trial, patients should be American Heart Association Stage B (people without current or previous symptoms of heart failure but with either structural heart disease, increased filling pressures in the heart or other risk factors) or better and New York Heart Association Functional Classification II (slight limitation of physical activity, comfortable at rest, ordinary physical activity results in fatigue, palpitation, shortness of breath or chest pain), or better
• 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) and/or family member available will also be eligible

Exclusion Criteria:

• Patients who have completed induction chemotherapy less than 2 weeks or more than 8 weeks prior to study enrollment
• Patients who have not recovered from adverse events due to prior anti-cancer therapy (i.e., have residual toxicities > grade 1) with the exception of alopecia and neuropathy grade =< 2
• Patients who are receiving any other investigational agents
• History of allergic reactions attributed to compounds of similar chemical or biologic composition to M3814 (peposertib)
• Evidence of distant metastatic disease
• More than 1 line of chemotherapy for the treatment of localized pancreatic cancer, unless the change in treatment was made only for toxicity
• Prior abdominal radiation
• Active inflammatory bowel disease or connective tissue disease
• Inability to swallow oral medications or gastrointestinal disease limiting absorption of oral agents
• History of anaphylactic reaction to iodinated intravenous (IV) contrast required for radiation simulation. Patients with mild reactions may be enrolled, but must receive premedications for contrast allergy prior to imaging
• Patients who cannot discontinue concomitant medications or herbal supplements that are strong inhibitors or strong inducers of cytochrome P450 (CYP) isoenzymes CYP3A4/5, CYP2CP, and CYP2C19. Concomitant use of CYP1A2, CYP2B6, and CYP3A4/5 substrates with a narrow therapeutic index are also excluded. Patients may confer with the study doctor to determine if alternative medications can be used. The following categories of medications and herbal supplements must be discontinued for at least the specified period of time before the patient can be treated:
• Strong inducers of CYP3A4/5, CYP2C9 and CYP2C19: >= 3 weeks prior to study treatment
• Strong inhibitors of CYP3A4/5, CYP2C9 and CYP2C19: >= 1 week prior to study treatment
• Substrates of CYP1A2, CYP2B6, and CYP3A4/5 with a narrow therapeutic index: >= 1 day prior to study treatment
• Because the lists of these agents are constantly changing, it is important to regularly consult a frequently-updated medical reference. As part of the enrollment/informed consent procedures, the patient will be counseled on the risk of interactions with other agents, and what to do if new medications need to be prescribed or if the patient is considering a new over-the-counter medicine or herbal product
• Patients who cannot discontinue concomitant proton-pump inhibitors (PPIs). Patients may confer with the study doctor to determine if such medications can be discontinued. These must be discontinued >= 5 days prior to study treatment. Patients do not need to discontinue calcium carbonate. H2 blockers and antacids are allowed.
• Patients who have received a live attenuated vaccine within 30 days of dosing with M3814 (peposertib)
• Patients with uncontrolled intercurrent illness
• Patients with psychiatric illness/social situations that would limit compliance with study requirements
• Pregnant women are excluded from this study because M3814 (peposertib) is a DNA-protein kinase (PK) inhibitor 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 M3814 (peposertib), breastfeeding should be discontinued if the mother is treated with M3814 (peposertib)
• Patients with a prior or concurrent malignancy whose natural history or treatment has the potential to interfere with the safety or efficacy assessment of this investigational regimen

1. Inclusion Criteria: Subjects must meet all the following criteria to participate in

this study. 1. Signed, written informed consent obtained prior to any study procedures. 2. Age > 18 years at the time of informed consent. 3. Metastatic solid tumor with ≥ 10% of tumor cells positive for KK-LC-1 by IHC assay. Due to the low frequency of KK-LC-1 expression in most cancers, screening will focus on gastric, NSCLC, TNBC, and cervix cancers. The IHC test will be performed by the Rutgers Cancer Institute, Department of Biorepository Services. 4. HLA-A*01:01 allele by HLA haplotype test. 5. Measurable disease per RECIST Criteria Version 1.1 at time of enrollment. 6. Prior treatment with cancer type-specific standard of care systemic cancer therapy is required. Standard treatment options must be considered and declined. Documentation of rationale is required if a subject is deemed unsuitable for standard therapy. 7. Subjects with < 3 brain metastases that have been treated with surgery or stereotactic radiosurgery are eligible. Lesions that have been treated with stereotactic radiosurgery must be clinically stable for one month before protocol treatment. Patients with surgically resected brain metastases are eligible. 8. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 at screening. 9. Negative pregnancy test for women under 55 and all women who have had a menstrual period in the last 12 months. A pregnancy tests is not required for women who have had a bilateral oophorectomy or hysterectomy. 10. Women of child-bearing potential must agree to use adequate contraception (i.e., intrauterine device, hormonal barrier method of birth control; abstinence; tubal ligation or vasectomy) prior to study entry and for 12 months after treatment. Should a women become pregnant or suspect she is pregnant while she is participating in this study, she should inform her treating physician immediately. 11. Participants must have organ and marrow function as defined below: 1. Leukocytes > 3,000/mcL 2. Absolute neutrophil count > 1,500/mcL 3. Platelets > 100,000/mcL 4. Hemoglobin > 9.0 g/dL 5. Total bilirubin within normal institutional limits except in participants with Gilbert's Syndrome who must have a total bilirubin < 3.0 mg/dL. 6. Serum AST (SGOT)/ALT (SGPT) < 2.5 x ULN 7. Calculated creatinine clearance (CrCl) >50 mL/min/1.73 m2for participants with creatinine levels above institutional normal (by the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation). 8. INR or a PTT ≤1.5 X ULN unless the subject is receiving anticoagulant therapy. Subjects on anticoagulant therapy must have a PT or PTT within therapeutic range and no history of severe hemorrhage. 12. Serology:
• HIV antibody negative
• Hepatitis B antigen negative
• Hepatitis C antibody negative or HCV RNC negative (i.e., no current HCV infection) 13. More than four weeks must have elapsed since any prior systemic therapy at the time the patient receives the KK-LC-1 TCR T cells. Adverse events from prior therapy must have resolved to ≤ grade 1 according to CTCAE Version 5.0 or have demonstrated clinical stability and meet the eligibility criteria for the protocol. 14. Oxygen saturation ≥ 92% on room air. 15. Left ventricular ejection fraction ≥45% by echocardiogram or MUGA for patients 50 years of age or older.

Exclusion Criteria: Subjects who meet any of the following criteria will be excluded from

participation in this study: 1. Current treatment with another investigational agent. 2. History of severe allergic reactions to compounds of similar chemical or biologic composition to agents in used in study. 3. Uncontrolled intercurrent illness such as active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations at the time of treatment that would limit compliance with study requirements. 4. Because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with KK-LC-1 TCR T cells, breastfeeding should be discontinued if the mother is treated with KK-LC-1 TCR cells. The potential risks may also apply to other agents used in this study. 5. Participants with a systemic immunodeficiency including acquired deficiency such as HIV or primary immunodeficiency such as Severe Combined Immunodeficiency Disease are ineligible. The experimental treatment being evaluated in this protocol depends on an intact immune system. Participants who have decreased immune competence may be less responsive to the treatment. 6. Participants on immunosuppressive drugs including corticosteroids unless meeting criteria outlined in Section 6.1 (Prohibited Medications). 7. Subjects with HLA-A*01:01 damaging mutation or allele loss or other molecular resistance detected by clinical or research genomic profiling will not be eligible. 8. Participants with potentially severe autoimmune diseases such as Crohn's disease, ulcerative colitis, rheumatoid arthritis, autoimmune hepatitis, autoimmune pancreatitis, or systemic lupus erythematosus are not eligible. Patients with less severe autoimmune diseases such as hypothyroidism, vitiligo, and other minor autoimmune disorders are eligible. 9. Participants with prior or concurrent malignancy whose natural history or treatment is unlikely to interfere with the safety or efficacy assessments of the investigational regimen are eligible for this trial. Examples include, but are not limited to: 1. Carcinoma in situ 2. Cutaneous skin cancers requiring only local excision 3. Low grade non-muscle invasive bladder cancer 4. Low grade prostate cancer Participants with prior or concurrent malignancy that do not meet the above criteria are excluded. 10. Subjects who received a live vaccine within 30 days prior to enrollment are not eligible. 11. Determination by the Principal Investigator that participation is not in the best interest of the research subject or may jeopardize the safety of the subject or integrity of the clinical trial data.

Inclusion Criteria:

• PHASE 1: Patients must have a histologically confirmed metastatic or locally advanced unresectable solid tumor that has progressed on or after available standard of care therapy or for which no acceptable standard of care therapy exists, or in which the patient declines standard of care therapy (each patient that declines standard of care therapy will be documented in the case report form)
• PHASE 2: Patients must have a histologically confirmed metastatic or locally advanced unresectable cholangiocarcinoma/gallbladder carcinoma that has progressed on gemcitabine, cisplatin, and durvalumab/pembrolizumab.
• Age >= 18 years
• Because no dosing or adverse event data are currently available on the use of peposertib (M3814) in combination with avelumab in patients < 18 years of age
• Eastern Cooperative Oncology Group (ECOG) performance status =< 2 (Karnofsky >= 60%)
• Patients with at least 1 index lesion to irradiate for whom palliative radiation treatment is indicated (including but not limited to pain and/or symptom control, prevention of disease -related complications, and preservation of organ function). Lung and liver lesions are preferred, though alternate lesions may be considered after discussion with trial principal investigator (PI). Up to 2 lesions may be considered for irradiation provided at least 1 lesion will receive the study treatment of total of 60 Gy and all prescribed irradiation will be completed within the radiation window
• Patients with at least 1 Response Evaluation Criteria in Solid Tumors (RECIST) measurable lesion (to be unirradiated) (defined as those accurately measured in at least one dimension, with the longest diameter to be recorded for non-nodal lesions and the shortest diameter for nodal lesions). Measurable is defined as at least 10 mm in longest diameter for solid tumors, at least 15 mm in shortest diameter for lymph nodes
• Patients must be willing to undergo fresh biopsies at baseline (as opposed to using archival tissue), in the event their baseline tissue was obtained > 12 months prior to study consent and/or they are randomized to the gamma H2AX, pNBS1 and pKAP1 IFA with beta CATN segmentation assay
• Absolute neutrophil count (ANC) >= 1,500/mcL
• Platelet count >= 100,000/mcL
• Hemoglobin >= 9.0 g/dL
• Serum creatinine =< 1.5 x upper limit of normal (ULN) OR calculated serum creatinine clearance (glomerular filtration rate [GFR] can be used in place of creatinine or creatinine clearance) >= 60 mL/min for participants with creatinine levels > 1.5 x institutional ULN
• Calculate serum creatinine clearance using the standard Cockcroft-Gault formula
• Serum total bilirubin =< 1.5 x ULN or direct bilirubin =< ULN for participants with total bilirubin > 1.5 x ULN
• Patients with known Gilbert disease with serum bilirubin level =< 3 x ULN are eligible
• Aspartate aminotransferase (AST) (serum glutamic-oxaloacetic transaminase [SGOT]) and alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT]) =< 2.5 x ULN or =< 5.0 x ULN for patients with hepatobiliary tumors/liver metastases
• Albumin >= 2.8 g/L
• International normalized ratio (INR) or prothrombin time (PT) or activated partial thromboplastin time (aPTT) =< 1.5 x ULN
• This applies only to patients not receiving therapeutic anticoagulation; patients receiving therapeutic anticoagulation should be on a stable dose
• Participants must have the ability to swallow and retain oral medication and not have any clinically significant gastrointestinal abnormalities that might alter absorption
• Female patients of childbearing potential must have a negative urine or serum pregnancy test. If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required. The effects of peposertib (M3814) and avelumab on the developing human fetus are unknown and there is the potential for teratogenic or abortifacient effects. For this reason, women and men 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 treatment, and for 6 months after completion of peposertib (M3814) and avelumab administration. 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. Because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with peposertib (M3814) and avelumab, breastfeeding should be discontinued if the mother is treated with peposertib (M3814) and avelumab
• Ability to understand and the willingness to sign a written informed consent document. Participants with impaired decision-making capacity (IDMC) who have a close caregiver or legally authorized representative (LAR) and/or family member available will also be eligible

Exclusion Criteria:

• PHASE I: Patients who have received prior anti-CTLA-4, anti-PD-1, anti-PD-L1 or other immune checkpoint inhibitor therapeutic antibodies or pathway-targeting agents
• PHASE II: Patients who have received prior anti-CTLA-4, anti-PD-1, anti-PD-L1 or other immune checkpoint inhibitor therapeutic antibodies or pathway-targeting agents with the following exceptions:
• Patients who have only received previous durvalumab (anti-PD-L1) in combination with gemcitabine +/- cisplatin as part of first line therapy (TOPAZ-1 regimen) are eligible
• Patients who have only received previous pembrolizumab (anti-PD-1) in combination with gemcitabine +/- cisplatin as part of first line therapy (KEYNOTE-966 regimen) are eligible
• Patients who have had chemotherapy, definitive radiation, biological cancer therapy, or investigational agent/device within 21 days of first planned dose of study therapy (within 14 days for palliative radiation). Previously irradiated lesions may be re-irradiated provided there is disease progression in the irradiated lesion and the prescribed radiation dosage can safely be re- administered
• Patients who have not recovered from adverse events due to prior anti-cancer therapy (i.e., have residual toxicities > Common Terminology Criteria for Adverse Events [CTCAE] grade 1) with the exception of alopecia
• Patients with untreated/uncontrolled central nervous system (CNS)/leptomeningeal disease. Patients with asymptomatic, treated CNS disease are eligible if the treating physician determines that immediate CNS specific treatment is not required and is unlikely to be required during the first cycle of therapy and the following criteria are met:
• Radiographic demonstration of clinical stability upon the completion of CNS-directed therapy and no evidence of interim progression between the completion of CNS-directed therapy and the screening radiographic study done >= 4 weeks from completion of radiotherapy and >= 2 weeks from discontinuation of corticosteroids
• No stereotactic radiation or whole-brain radiation within 28 days prior to randomization
• Patients with active autoimmune disease requiring systemic corticosteroids greater than the equivalent of prednisone 10 mg daily including but not limited to: systemic lupus erythematosus, rheumatoid arthritis, inflammatory bowel disease, colitis, 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, with the following exceptions:
• Patients with a history of autoimmune hypothyroidism on a stable dose of thyroid replacement hormone are eligible
• Patients with controlled type 1 diabetes mellitus on a stable insulin regimen are eligible
• Patients with eczema, psoriasis, lichen simplex chronicus of vitiligo with dermatologic manifestations only who require only low potency topical steroids (e.g., hydrocortisone 2.5%, hydrocortisone butyrate 0.1%, fluocinolone 0.01%, desonide 0.05%, alclometasone dipropionate 0.05%) are eligible
• Patients receiving treatment with systemic immunosuppressive medications (including, but not limited to, prednisone, cyclophosphamide, azathioprine, methotrexate, thalidomide, and anti-tumor necrosis factor [TNF] agents) within 6 weeks must discontinue these medications prior to starting peposertib (M3814) and avelumab on day 7, with the exception of:
• Patients with active autoimmune disease managed with systemic corticosteroids less than the equivalent of prednisone 10 mg daily
• Patients who 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 and adrenocortical insufficiency
• Patients who have undergone prior solid organ or bone marrow transplant with the exception of patients with prior renal transplant for whom dialysis may be employed in the event of graft rejection
• Patients with uncontrolled intercurrent illness (e.g., including but not limited to uncontrolled hypertension [HTN] [systolic blood pressure (BP) > 150, diastolic BP > 100], symptomatic congestive heart failure [CHF], unstable angina pectoris, ischemic myocardial infarction [MI] within 6 months, cardiac arrhythmia, recent transient ischemic attack [TIA or cerebrovascular accident (CVA)]) within 6 months
• Patients with serious active infection (e.g. requiring hospitalization and/or intravenous [IV] antibiotics) within 4 weeks prior to starting peposertib (M3814) and avelumab, or signs/symptoms of infection or receiving oral or IV antibiotics for the treatment of active systemic infection within 2 weeks prior to starting peposertib (M3814) and avelumab. Patients receiving prophylactic antibiotics are eligible
• Patients with known chronic hepatitis B virus (HBV) infection must have an undetectable viral load on suppressive therapy if indicated. Patients with known chronic hepatitis C (HCV) infection must have been treated and cured. Patients who are currently on curative treatment are eligible if they have an undetectable HCV viral load
• Patients with known human immunodeficiency virus (HIV) are allowed on study provided they have:
• A stable regimen of highly active anti-retroviral therapy (HAART)
• No requirement for concurrent antibiotics or antifungal agents for the prevention of opportunistic infection
• A CD4 count above 250 cells/mcL
• An undetectable HIV viral load on standard polymerase chain reaction (PCR)-based testing
• Patients with history of idiopathic pulmonary fibrosis, pneumonitis (including drug induced), organizing pneumonia (e.g., bronchiolitis obliterans, cryptogenic organizing pneumonia), or evidence of active pneumonitis on screening chest computed tomography (CT) scan
• Patients with known concurrent malignancy that is expected to require active treatment within two years, or may interfere with the interpretation of the efficacy and safety outcomes of this study in the opinion of the treating investigator. Superficial bladder cancer, nonmelanoma skin cancers, and low-grade prostate cancer not requiring cytotoxic therapy should not exclude participation in this trial. Patients with chronic lymphocytic leukemia (CLL) may be enrolled if they do not require active chemotherapy and their hematologic, renal and hepatic function meets criteria previously mentioned
• Patients with psychiatric illness/social situations that would limit compliance with study requirements
• History of allergic reactions attributed to compounds of similar chemical or biologic composition to peposertib (M3814) or avelumab
• Patients unable to discontinue medications or substances that are potent inhibitors, inducers or sensitive substrates of CYP3A4/5 or CYP2C19 prior to starting peposertib (M3814) and avelumab are ineligible. Medications or substances that are strong inhibitors of CYP3A4/5 or CYP2C19 must be discontinued at least 1 week prior to first peposertib (M3814) dose. Strong inducers of CYP3A4/5 or CYP2C19 must be stopped at least 3 weeks prior to the first dose. Drugs mainly metabolized by CYP3A with a narrow therapeutic index as judged by the investigator must stop at least 1 day prior to first peposertib (M3814) dose. Because the lists of these agents are constantly changing, it is important to regularly consult a frequently updated medical reference. As part of the enrollment/informed consent procedures, the patient will be counseled on the risk of interactions with other agents, and what to do if new medications need to be prescribed or if the patient is considering a new over-the-counter medicine or herbal product. The primary elimination mechanism of avelumab is proteolytic degradation, thus there are no contraindicated medications with respect to avelumab
• Patients who cannot discontinue concomitant proton-pump inhibitors (PPIs) prior to starting peposertib (M3814) and avelumab. These must be discontinued >= 5 days prior to starting peposertib (M3814) and avelumab. Patients do not need to discontinue calcium carbonate. H2 blockers are allowed provided they are taken at least 2 hours after peposertib (M3814) dose
• Patients receiving sorivudine or any chemically related analogues (such as brivudine) and not able to discontinue prior to starting peposertib (M3814) and avelumab are excluded
• Pregnant and lactating women are excluded from this study because peposertib (M3814) and avelumab are agents 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 peposertib (M3814) and avelumab, breastfeeding should be discontinued if the mother is treated with peposertib (M3814) and avelumab
• Patients who have received live vaccination within 30 days before starting peposertib (M3814) and avelumab

Inclusion Criteria:

• Patients must have metastatic, histologically confirmed well-differentiated neuroendocrine tumor with positive gallium 68 DOTATATE or copper 64 DOTATATE scan. Lesions on dotatate scan will be considered positive if the standardized uptake value maximum (SUVmax) of target lesion is > 2 times standardized uptake value (SUV) mean of normal liver parenchyma. Patients with lung neuroendocrine tumors (NETs) are excluded from the trial
• Patients must have progressive disease based on RECIST criteria, version 1.1 evidenced with CT scans/MRI obtained within 24 months from enrollment
• Patients must have measurable disease per RECIST 1.1
• Failure of at least one prior systemic cancer treatment with somatostatin analogs
• No prior exposure to peptide receptor radionuclide therapy
• Recovered from adverse events of previously administered therapeutic agents (i.e., to grade 2 or less toxicity) according to Common Terminology Criteria for Adverse Events (CTCAE) 5.0
• Age >= 18 years
• Because no dosing or adverse event data are currently available on the use of triapine in combination with lutetium Lu 177 dotatate in patients < 18 years of age, children are excluded from this study
• Eastern Cooperative Oncology Group (ECOG) performance status =< 2 (Karnofsky >= 60%)
• Absolute neutrophil count >= 1,500/mcL
• Platelets >= 100,000/mcL
• Total bilirubin =< 1.5 institutional upper limit of normal (ULN)
• Aspartate aminotransferase (AST) (serum glutamic-oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT]) =< 3 x institutional ULN
• Serum creatinine =< 1.5 institutional ULN. Creatinine > 1.5 ULN will require a measured creatinine clearance (CrCl) > 50 ml/min to qualify
• Hemoglobin > 5.0 mmol/L (> 8.0 g/dL)
• Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial
• 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 with treated brain metastases and off steroids are eligible if follow-up brain imaging after central nervous system (CNS)-directed therapy shows no evidence of progression for at least 4 weeks prior to enrollment in the study. Patients with a history of brain metastases must have a head CT with contrast to document stable disease prior to enrollment in the study
• 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
• Pregnancy precaution: Men and women should avoid pregnancy for seven months after the date of their last treatment with lutetium Lu 177 dotatate. It is noteworthy that beta-human chorionic gonadotropin (beta-HCG) may be secreted by a small percentage of NETs, such that, in addition to being a pregnancy marker, it also is a tumor marker. Consequently, NET female patients with positive beta-HCG (> 5 mIU/mL) at baseline can be eligible to enter the study and receive treatment if pregnancy can be excluded by lack of expected doubling of beta-HCG and negative pelvic ultrasound. Normally, in pregnant subjects beta-HCG doubles every 2 days during the first 4 weeks of pregnancy and every 3.5 days by weeks 6 to 7. Women of childbearing potential include any female who has experienced menarche and who has not undergone successful surgical sterilization (hysterectomy, bilateral tubal ligation, or bilateral ovariectomy) or is not postmenopausal (defined as amenorrhea > 12 consecutive months, and for women on hormone replacement therapy, only with a documented plasma follicle-stimulating hormone [FSH] level > 35 mIU/mL). Even women who are using oral, implanted, or injected contraceptive hormones, an intrauterine device (IUD), or barrier methods (diaphragm, condoms, spermicidal) to prevent pregnancy, are practicing abstinence or where the partner is sterile (e.g., vasectomy) should be considered to be of childbearing potential. Postmenopausal women who have fertilized eggs implanted are also considered to be of childbearing potential. Acceptable methods of contraception may include total abstinence at the discretion of the Investigator in cases where the age, career, lifestyle, or sexual orientation of the patient ensures compliance. Periodic abstinence (e.g., calendar, ovulation, symptothermal, post-ovulation methods) and withdrawal are not acceptable methods of contraception. Reliable contraception (hormonal or barrier method of birth control; abstinence) should be maintained throughout the study and for 7 months after study treatment discontinuation. All men and women of childbearing potential and male partners must use a double-barrier method of birth control or practice continuous abstinence from heterosexual contact throughout the study and for seven months after the end of the last treatment
• Ability to understand and the willingness to sign a written informed consent document

Exclusion Criteria:

• Patients who have not recovered from adverse events of previously administered therapeutic agents (i.e., have residual toxicities > grade 2) according to CTCAE 5.0, with the exception of alopecia
• Patients who are receiving any other investigational agents
• History of allergic reactions attributed to compounds of similar chemical or biologic composition to triapine or lutetium Lu 177 dotatate
• Patients with uncontrolled intercurrent illness
• Uncontrolled congestive heart failure (New York Heart Association [NYHA] III, IV)
• Pregnant women are excluded from this study because triapine is a ribonucleotide reductase (RNR) inhibitor and lutetium Lu 177 dotatate is a peptide receptor radionuclide therapy 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 triapine and lutetium Lu 177 dotatate, breastfeeding should be discontinued if the mother is treated with triapine and lutetium Lu 177 dotatate and for 2.5 months following the last treatment
• Inability to swallow oral medications or gastrointestinal disease limiting absorption of oral agents
• Patients with any other significant condition, currently uncontrolled by treatment, which may interfere with completion of the study

Inclusion Criteria:

1. Written informed consent and HIPAA authorization for release of personal health information. NOTE: HIPAA authorization may be included in the informed consent or obtained separately. 2. Age ≥ 18 years at the time of consent. 3. ECOG Performance Status of 0-1 within 30 days prior to registration. 4. Histologically proven stage I (T1N0), IIA (T2N0), IIB (T1/2N1), or IIIA (T3 N0/1) invasive squamous cell carcinoma of the anus by AJCC version 9. 5. Patient deemed ineligible for standard of care treatment with 5-fluorouracil (5FU) and mitomycin-C (MMC) concurrently with radiation per treating investigator. 6. Patient is treatment naïve for anal cancer diagnosis. 7. Measurable disease according to RECIST v1.1 within 30 days prior to registration. 8. Archival or newly obtained tissue available for planned correlative analysis. If tissue is not available, subjects may choose to have a standard of care biopsy to meet eligibility. 9. Demonstrate adequate organ function as defined below. All screening labs to be obtained within 30 days prior to registration.
• White blood cell (WBC) ≥ 1500 K/mm^3
• Absolute Neutrophil Count (ANC) ≥ 1500/mm^3
• Hemoglobin (Hgb)a ≥ 9 g/dL
• Platelets (Plt) ≥ 100,000 g/dL
• Creatinine ≤ 1.5 × upper limit of normal (ULN) OR Measured or calculated creatinine clearance (GFR can also be used in place of creatinine or CrCl) ≥30 mL/min for creatinine levels >1.5 × institutional ULN
• Total bilirubin ≤ 1.5 × ULN OR direct bilirubin ≤ULN for participants with total bilirubin levels >1.5 × ULN
• Aspartate aminotransferase (AST) ≤ 2.5 × ULN
• Alanine aminotransferase (ALT) ≤ 2.5 × ULN 10. Females of childbearing potential who are sexually active with a male able to father a child must have a negative pregnancy test (serum or urine) within 14 days prior to registration. 11. Females of childbearing potential who are sexually active with a male able to father a child must be willing to abstain from heterosexual activity or use an effective method(s) of contraception. Males able to father a child who are sexually active with female of childbearing potential must be willing to abstain from heterosexual activity or to use an effective method(s) of contraception. 12. If a subject is HIV-infected, participants must have well-controlled HIV on antiretroviral therapy (ART), defined as: 1. Participants on ART must have a CD4+ T-cell count ≥350 cells/mm3 at the time of screening 2. Participants on ART must have achieved and maintained virologic suppression defined as confirmed HIV RNA level below 50 or the LLOQ (below the limit of detection) using the locally available assay at the time of screening and for at least 12 weeks before screening. 3. Participants must not have had any AIDS-defining opportunistic infections within the past 12 months. 4. Participants on ART must have been on a stable regimen, without changes in drugs or dose modification, for at least 4 weeks before study entry (Day 1) and agree to continue ART throughout the study. NOTE: HIV testing is not required for eligibility. 13. If a subject has evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated. If a subject has a history of hepatitis C virus (HCV) infection, it must have been treated and cured. For patients with HCV infection who are currently on treatment, the HCV viral load must be undetectable to be eligible for this trial. Testing is not required at screening unless mandated by local policy. 14. Ability of the subject to understand and comply with study procedures for the entire length of the study, as determined by the enrolling physician or protocol designee.

Exclusion Criteria:

1. Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection requiring systemic therapy, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situation that would limit compliance with study requirements. 2. Has known additional malignancy that is progressing or has required active treatment within the past 2 years and is not deemed by the investigator to be at low risk for recurrence. Notes: Participants with basal cell carcinoma of the skin, squamous cell carcinoma of the skin or carcinoma in situ (ex. cervical, breast) that have undergone potentially curative therapy are eligible. Participants with carcinoma in situ of the bladder are not eligible. Participants with low-risk early-stage prostate cancer (T1-T2a, Gleason score ≤8, and PSA <10 ng/mL) either treated with definitive intent or untreated in active surveillance with stable disease are eligible. 3. Pregnant or breastfeeding or expecting to conceive or father children within the projected duration of the study, starting with the screening visit through 120 days after the last dose of study drug(s). NOTE: breast milk cannot be stored for future use while the mother is being treated on study. 4. Has known active CNS metastases and/or carcinomatous meningitis. Participants with previously treated brain metastases may participate provided they are radiologically stable, i.e. without evidence of progression for at least 4 weeks by repeat imaging (note that the repeat imaging should be performed during study screening), clinically stable and without requirement of steroid treatment for at least 14 days prior to study registration. 5. Has severe hypersensitivity (≥Grade 3) to pembrolizumab and/or any of its excipients. 6. Patients with an active autoimmune disease requiring immunosuppression in the past 2 years. 7. Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy equivalent to > 10mg prednisone per day or any other form of immunosuppressive therapy within 7 days prior to registration. NOTE: Topical corticosteroid or inhaled corticosteroids are allowed. 8. Has received a live vaccine or live-attenuated vaccine within 30 days prior to registration. Administration of killed vaccines is allowed. Examples of live vaccines include, but are not limited to, the following: measles, mumps, rubella, chicken pox, yellow fever, rabies, BCG, and typhoid oral vaccine. Intranasal influenza vaccines (e.g., Flu-Mist ®) are live attenuated vaccines and are not allowed. NOTE: No live vaccines may be administered while participating in the trial. 9. Has a history of (non-infectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease. 10. Has received any investigational drug or used an investigational device for the treatment of anal cancer within 30 days prior to registration. 11. Has had an allogeneic bone marrow/stem cell or solid organ transplant. 12. Has not adequately recovered from major surgery or has ongoing surgical complications. 13. Has a history or current evidence of any condition, therapy, or laboratory abnormality or other circumstance that might confound the results of the study, interfere with the participant's participation for the full duration of the study, such that it is not in the best interest of the participant to participate, in the opinion of the treating investigator. 14. Has known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the trial. 15. Has had prior anti-PD1 immune checkpoint blockade. 16. Is taking a contraindicated medication and is unable to discontinue or switch to an alternative medication within 7 days of initiating the study drugs.

Inclusion Criteria:

• Histologically and/or cytologically confirmed metastatic or unresectable adenocarcinoma of esophageal, gastroesophageal junction or gastric origin
• Tumor is HER2 negative by standard local testing methodology
• Eastern Cooperative Oncology Group Performance Status (ECOG PS) of 0 - 2
• Measurable disease by response evaluation criteria in solid tumors (RECIST) v1.1
• No prior systemic therapy for the present cancer given in the metastatic setting and > 6 months from administration of peri-operative chemotherapy, if applicable o Note: up to two prior cycles of mFOLFOX6 for the present illness is permitted if patients otherwise qualify for the study with adequate baseline imaging
• At least 18 years of age
• Adequate bone marrow and organ functions as defined by:
• Absolute neutrophil count ≥ 1500 cells/ μL
• Hemoglobin ≥ 8 g/ dL
• Platelets > 100,000 / μL
• Creatinine ≤ 1.5 x upper limit of normal (ULN) OR creatinine clearance ≥ 30 mL/min by Cockroft-Gault
• Total bilirubin ≤ ULN
• Aspartate aminotransferase (AST)/ Alanine aminotransferase (ALT) < 2.5 x ULN, unless with liver metastases and then must be <5 x ULN of normal
• Women and men of childbearing potential must agree to use adequate contraception (hormonal or barrier method of birth control or abstinence) prior to study entry and for the duration of study participation. Should a woman become pregnant or suspect pregnancy on study, she must notify her treating physician immediately.
• Ability to understand the nature of this study protocol and give written informed consent.
• Willingness and ability to comply with scheduled visits, treatment plans laboratory tests and other study procedures.

Exclusion Criteria:

• Receipt of any investigational agents at the time of registration
• Known, untreated brain metastases
• Grade two or greater peripheral neuropathy
• Presence of any additional active malignancy within the past three years where the malignancy is at least reasonably likely to later the course of therapy, require systemic therapy or interfere with imaging assessments
• For those patients who are going to receive nivolumab
• No active use of systemic corticosteroids at the time of enrollment, at a dose equivalent of 10 mg/day or prednisone
• Clinically significant autoimmune disease which is active or has required systemic immunosuppression within the last two years
• Prior organ transplant or bone marrow transplant
• History of interstitial lung disease or pneumonitis
• Uncontrolled intercurrent illness, including significant active infection, symptomatic congestive heart failure, unstable angina or active arrhythmia
• Major surgery within the four weeks prior to initiation of study treatment
• A history of allergy or hypersensitivity to any of the study drugs
• Any additional significant medical condition, laboratory abnormality, or psychiatric illness that would prevent the subject from fully participating in the study

Inclusion Criteria:

• Each patient eligible to participate in this study must meet all the following criteria: 1. Written informed consent 2. Primary diagnosis of HCC, planned to receive radiation, treatment naïve to systemic therapy for HCC, prior TACE permitted 3. Hepatocellular carcinoma diagnosis by histologic findings and/or imaging criteria of LI-RADS 5 4. Eastern Cooperative Oncology Group performance status score of 0-2 5. Age>/=18 years 6. Child-Pugh class A liver function or B7, BCLC A-C or deemed not a candidate for surgery or liver transplantation 7. No extrahepatic metastasis detected on CT chest with or without IV contrast, abdomen and pelvis with IV and oral contrast (triphasic-if feasible based on kidney function), or MRI abdomen/liver and chest CT. 8. Females of childbearing potential must be willing to use a highly effective method of birth control for the duration of the study, and ≥ 6 months after the last dose of tislelizumab, and have a negative urine or serum pregnancy test ≤ 7 days of first dose of study drug 9. Non-sterile males must be willing to use a highly effective method of birth control for the duration of the study and for ≥ 6 months after the last dose of tislelizumab. Males must agree not to donate or bank sperm during treatment with tislelizumab and for > 6 months after treatment stop. 10. Must have 1 target lesion measurable in 1 dimension according to RECIST 1.1. 11. Demonstrate adequate bone marrow and organ function as defined below: 1. Hematologic - Absolute neutrophil count (ANC) ≥ 1,500/mcL, Hemoglobin > 8.5 g/dL, Platelet count ≥ 75,000/mcL 2. Renal - Serum creatinine OR calculated* serum creatinine clearance (GFR can be used in place of creatinine or creatinine clearance) ≤ 1.5x upper limit of normal (ULN) OR ≥ 30 mL/min for participants with creatinine levels > 1.5x institutional ULN
• Calculate serum creatinine clearance using the standard Cockcroft-Gault formula. Urine protein Urine dipstick for proteinuria < 2+ within 7 days prior to start of study treatment *Participants with ≥ 2+ proteinuria on dipstick analysis at baseline should undergo a 24-hour urine collection which must demonstrate < 1g of protein in 24 hours 3. Hepatic - Serum total bilirubin ≤ 3 mg/dL , AST (SGOT) and ALT (SGPT) ≤ 5x ULN , Alkaline phosphatase (ALP) ≤ 8x ULN Coagulation - International Normalized Ratio (INR) or prothrombin time (PT) or activated partial thromboplastin time (aPTT) ≤ 2.0x ULN *This applies only to participants not receiving therapeutic anticoagulation; participants receiving therapeutic anticoagulation should be on a stable dose.

Exclusion Criteria:

1. Prior radiotherapy to the region of the liver that would result in excessive doses to normal tissues due to overlap of radiation therapy fields 2. Prior selective internal radiotherapy/hepatic arterial Yttrium therapy, at any time 3. Severe, active co-morbidity as per investigator 4. More than five discrete intrahepatic parenchymal foci of definite HCC or left/right or main portal vein thrombus 5. Direct tumor extension into the stomach, duodenum, small bowel or large bowel 6. Measurable common or main branch biliary duct involvement with HCC 7. Extrahepatic metastases or malignant nodes (that enhance with typical features of HCC) > 3.0 cm, in sum of maximal diameters (e.g. presence of one 3.4 cm metastatic lymph node or two 2 cm lung lesions). Note: benign non-enhancing periportal lymphadenopathy is not unusual in the presence of hepatitis and is permitted, even if the sum of enlarged nodes is > 2.0 cm. 8. Prior liver transplant 9. HIV positive 10. Immunodeficiency requiring chronic systemic therapy or that may relapse 11. Participants who have received prior immunotherapy. 12. Participants with clinically meaningful ascites, defined as ascites requiring non-pharmacologic intervention (e.g. paracentesis) to maintain symptomatic control a. Note: Participants with ascites who require pharmacologic intervention (e.g. diuretics) to maintain symptomatic control and who have been on stable doses of diuretics for two months days prior to the first dose of study treatment are eligible. 13. Participants with clinically meaningful encephalopathy 14. Participants who have undergone prior solid organ or bone marrow transplant except for patients with prior renal transplant for whom dialysis may be employed in the event of graft rejection. 15. Patients must have documented hepatitis virology status. a. Participants with active hepatitis B virus (HBV) infection must have a viral load < 500 IU/mL within 28 days prior to start of Tislelizumab and be on suppressive therapy (per local standard of care) for a minimum of fourteen days prior to start of study treatment and for the length of the study. b. Participants with co-infection with HBV and hepatitis C virus (HCV) are excluded. c. Participants with a history of HCV infection but with negative HCV RNA by PCR are considered non-infected with HCV and can enroll. 16. Participants with a history of autoimmune hypothyroidism on a stable dose of thyroid replacement hormone are eligible. 17. Participants with controlled Type 1 diabetes mellitus on a stable insulin regimen are eligible. 18. Participants with eczema, psoriasis, lichen simplex chronicus of vitiligo with dermatologic manifestations only are eligible provided: 1) rash covers < 10% of body surface area (BSA), disease is well controlled at baseline and requires only low potency topical steroids (e.g., hydrocortisone 2.5%, hydrocortisone butyrate 0.1%, flucinolone 0.01%, desonide 0.05%, aclometasone dipropionate 0.05%). 19. Any malignancy ≤ 5 years before first dose of study drug except for the specific cancer under investigation in this study and any locally recurring cancer that has been treated curatively (e.g. resected basal or squamous cell skin cancer, superficial bladder cancer, carcinoma in situ of the cervix or breast). 20. Treatment with a live, attenuated vaccine within four weeks prior to initiation of study treatment with Tislelizumab. 1. Note: Seasonal vaccines for influenza and COVID-19 are generally inactivated vaccines and are allowed. Intranasal vaccines are live vaccines and are not allowed. 21. Any condition that required systemic treatment with either corticosteroids (> 10 mg daily of prednisone or equivalent) or other immunosuppressive medication ≤ 14 days before first dose of study drug a. Note: Participants who are currently or have previously been on any of the following steroid regimens are not excluded: i. Adrenal replacement steroid (dose ≤ 10 mg daily of prednisone or equivalent) ii. Topical, ocular, intra-articular, intranasal, or inhaled corticosteroid with minimal systemic absorption iii. Short course (≤ 7 days) of corticosteroid prescribed prophylactically (e.g., for contrast dye allergy) or for the treatment of a non- autoimmune condition (e.g., delayed-type hypersensitivity reaction caused by contact allergen) 22. With uncontrolled diabetes or > Grade 1 laboratory test abnormalities in potassium, sodium, or corrected calcium despite standard medical management or ≥ Grade 3 hypoalbuminemia ≤ 14 days before first dose of study drug 23. With history of interstitial lung disease, non-infectious pneumonitis or uncontrolled diseases including pulmonary fibrosis, acute lung diseases, etc. 24. With severe chronic or active infections requiring systemic antibacterial, antifungal or antiviral therapy, including tuberculosis infection, etc. 25. Severe infections within 4 weeks before first dose of study drug, including but not limited to hospitalization for complications of infection, bacteremia, or severe pneumonia. 26. Received therapeutic oral or intravenous antibiotics within two weeks before first dose of study drug 27. Any major surgical procedure requiring general anesthesia ≤ 28 days before first dose of study drug 28. Any of the following cardiovascular risk factors: a. Cardiac chest pain, defined as moderate pain that limits instrumental activities of daily living, ≤ 28 days before first dose of study drug b. Pulmonary embolism ≤ 28 days before first dose of study drug c. Any history of acute myocardial infarction ≤ 6 months before first dose of study drug d. Any history of heart failure meeting New York Heart Association (NYHA) Classification III or IV (Appendix 4) ≤ 6 months before first dose of study drug e .Any event of ventricular arrhythmia ≥ Grade 2 in severity ≤ 6 months before first dose of study drug f. Any history of cerebrovascular accident ≤ 6 months before first dose of study drug 29. Has received any herbal medicine used to control cancer within fourteen days of the first study drug administration 30. Participants with toxicities (because of prior anticancer therapy) which have not recovered to baseline or stabilized, except for AEs not considered a likely safety risk (e.g., alopecia, neuropathy and specific laboratory abnormalities) 31. Underlying medical conditions (including laboratory abnormalities) or alcohol or drug abuse or dependence that, will be unfavorable for the administration of study drug or affect the explanation of drug toxicity or AEs or result in insufficient or might impair compliance with study c conduct. 32. Concurrent participation in another therapeutic clinical study.

General Inclusion Criteria:

• Locally advanced or metastatic and/or unresectable HCC with diagnosis confirmed by histology/cytology or clinically by American Association for the Study of Liver Diseases (AASLD) criteria in cirrhotic patients
• Disease that is not amenable to curative surgical and/or locoregional therapies
• No prior systemic treatment (including systemic investigational agents) for locally advanced or metastatic and/or unresectable HCC
• Measurable disease (at least one untreated target lesion) according to RECIST v1.1
• ECOG Performance Status of 0-2 within 7 days prior to initiation of study treatment
• Child-Pugh B7 or B8 cirrhosis at screening and within 7 days prior to study treatment
• Adequate hematologic and end-organ function
• Life expectancy of at least 12 weeks
• Female participants of childbearing potential must be willing to avoid pregnancy and egg donation

General Exclusion Criteria:

• Pregnancy or breastfeeding
• Prior treatment with CD137 agonists or immune checkpoint blockade therapies
• Treatment with investigational therapy within 28 days prior to initiation of study treatment
• Treatment with locoregional therapy to liver within 28 days prior to initiation of study treatment, or non-recovery from side effects of any such procedure
• Treatment with systemic immunostimulatory agents
• Treatment with systemic immunosuppressive medication
• Treatment with a live, attenuated vaccine within 4 weeks prior to initiation of study treatment
• Inadequately controlled hypertension
• Active or history of autoimmune disease or immune deficiency
• History of idiopathic pulmonary fibrosis, organizing pneumonia, drug-induced pneumonitis, or idiopathic pneumonitis, or evidence of active pneumonitis on screening chest computed tomography (CT) scan
• Patients who have a known concurrent malignancy that is progressing or requires active treatment, who have not completely recovered from treatment, or who have a significant malignancy history that, in the opinion of the investigator, should preclude participation.
• Known fibrolamellar HCC, sarcomatoid HCC, other rare HCC variant, or mixed cholangiocarcinoma and HCC
• Symptomatic, untreated, or actively progressing central nervous system (CNS) metastases
• Prior allogeneic stem cell or solid organ transplantation
• Listed for liver transplantation
• Co-infection with hepatitis B virus (HBV) and hepatitis C virus (HCV)
• Untreated or incompletely treated esophageal and/or gastric varices with bleeding or that are at high risk for bleeding
• A prior bleeding event due to esophageal and/or gastric varices within 6 months prior to initiation of study treatment
• Grade ≥3 hemorrhage or bleeding event within 6 months prior to initiation of study treatment
• History of hepatic encephalopathy requiring hospitalization or treatment escalation within 6 months prior to study treatment, or any continued symptoms of encephalopathy despite medical management
• History, planned, or recommended placement of transjugular intrahepatic portosystemic shunt (TIPS)
• History of ascites requiring therapeutic paracentesis over the last 3 months
• History of spontaneous bacterial peritonitis within last 12 months

Inclusion Criteria:

PRE-REGISTRATION:
• Pathology: Histologic or cytologic proof of pancreatic adenocarcinoma or adenosquamous carcinoma
• TNM Stage: Tx-4, N0-1, M0 (M0 disease does not include spread to distant lymph nodes and organs)
• Resectable Primary Tumor: Local radiographic reading must be consistent with resectable disease defined as the following on 1) arterial and venous phase contrast-enhanced abdominal/pelvic CT scan or abdominal/pelvic magnetic resonance imaging (MRI) scan and 2) chest CT:
• No involvement or abutment of the celiac artery, common hepatic artery, superior mesenteric artery, or replaced right hepatic artery (if applicable)
• Less than 180 degree interface between tumor and vessel wall of the portal vein or superior mesenteric vein, and patent portal vein/splenic vein confluence
• No evidence of metastatic disease
• Measurable disease or non-measurable disease o Non-measurable disease is defined as cytologic or histologic confirmation of adenocarcinoma of adenosquamous carcinoma by fine needle aspiration or core-biopsy of the pancreas without measurable disease by radiographic imagingREGISTRATION:
• Confirmation of resectable disease by real-time central imaging review by the Alliance Imaging Core Lab at Imaging and Radiation Oncology Core (IROC) Ohio
• Determined to be appropriate candidate for curative-intent pancreatectomy by surgeon intending to perform the resection
• No prior radiation therapy, chemotherapy, targeted therapy, investigational therapy, or surgery for pancreatic cancer
• Not pregnant and not nursing, because this study involves an agent that has known genotoxic, mutagenic, and teratogenic effects.
• Therefore, for women of childbearing potential only, a negative pregnancy test done =< 14 days prior to registration is required
• Eastern Cooperative Oncology Group (ECOG) performance status 0-1
• Total Neuropathy Score < 2
• Absolute neutrophil count (ANC) >= 1,500/uL
• Platelet count >= 100,000/uL
• Total bilirubin =< 1.5 x upper limit of normal (ULN) (If obstructive jaundice is present, then biliary drainage must be initiated and total bilirubin =< 3.0)
• Creatinine =< 1.5 x ULN OR calculated (Calc.) creatinine clearance >= 30 mL/min (Calculated using the Cockcroft-Gault equation)
• No known Gilbert's Syndrome or known homozygosity for UGAT1A1*28 polymorphism
• No comorbid conditions that would prohibit curative-intent pancreatectomy
• Chronic concomitant treatment with strong inhibitors of CYP3A4 is not allowed on this study. Patients on strong CYP3A4 inhibitors must discontinue the drug prior to registration
• Chronic concomitant treatment with strong inducers of CYP3A4 is not allowed on this study. Patients on strong CYP3A4 inducers must discontinue the drug prior to registration

Inclusion Criteria:

• Participants must have histologically or radiographically confirmed diagnosis of pancreatic cancer or a pancreatic lesion with malignant potential
• Participants must have an elective distal pancreatectomy planned to occur within 60 days after registration/randomization date
• Participants must not have a known history of a prior diagnosis of malabsorption syndrome
• Participants must not have been treated with any somatostatin analogue within 180 days prior to registration/randomization
• Participants must not have been treated with radiation therapy for their pancreas malignancy at any time prior to registration/randomization
• Participants must not have been treated with peptide receptor radionuclide therapy (PRRT) at any time prior to registration/randomization
• Participants must be ≥ 18 years old
• Participants must have a complete documented medical history and physical exam within 28 days prior to registration/randomization
• Participants must have a creatinine ≤ the institutional upper limit of normal (IULN) OR a measured OR calculated creatinine clearance ≥ 50 mL/min using the following Cockcroft -Gault formula within 60 days prior to registration/randomization
• Participants must complete a pre-registration screening to identify any of the medications below, allowing the study team and treating physician to develop a monitoring plan as needed. Participants taking medications with known interactions with lanreotide may remain eligible if appropriate monitoring and management are in place. These medications include:
• Diabetes medications (insulin or oral hypoglycemics): Blood sugar will be monitored, and medication dose adjustments made as needed
• Cyclosporine: Dosage adjustments may be required to maintain therapeutic levels
• Bromocriptine: Dose adjustments may be considered to account for absorption changes
• Heart medications (e.g., beta blockers): Heart rate will be monitored, and medication doses adjusted if necessary
• CYP3A4-metabolized medications: Dose adjustments may be considered to avoid increased exposure
• In the opinion of the treating surgeon, based on preoperative data, the participant must not require a modified Appleby-type procedure (distal pancreatectomy with celiac axis resection) or multivisceral resection (e.g., stomach, colon, etc.) at the time of distal pancreatectomy
• NOTE: planned removal of the gallbladder or spleen at the time of distal pancreatectomy is not considered multivisceral resection and is permissible
• In the opinion of the treating surgeon, based on preoperative data, the participant must not require a tumor enucleation
• Participants must not have moderate to severe hepatic impairment as defined by liver enzyme elevation more than 5 times the institutional upper limit of normal (either aspartate aminotransferase [AST] > 190 U/L or alanine aminotransferase [ALT] > 320 U/L) within 60 days prior to registration/randomization. Transient elevation at the time of screening that resolves prior to study enrollment is acceptable
• Participants must not be pregnant or nursing (nursing includes breast milk fed to an infant by any means, including from the breast, milk expressed by hand, or pumped)
• Individuals who are of reproductive potential must have agreed to use an effective contraceptive method during the whole period of the study and for three months after the study drug administration, with details provided as a part of the consent process. A person who has had menses at any time in the preceding 12 consecutive months or who has semen likely to contain sperm is considered to be of "reproductive potential." In addition to routine contraceptive methods, "effective contraception" also includes refraining from sexual activity that might result in pregnancy and surgery intended to prevent pregnancy (or with a side-effect of pregnancy prevention) including hysterectomy, bilateral oophorectomy, bilateral tubal ligation/occlusion, and vasectomy with testing showing no sperm in the semen
• Participants must be offered the opportunity to participate in specimen banking
• Participants who can complete EORTC QLQ-C30, EORTC QLQ-PAN26, and EQ-5D-5L forms in English or Spanish, must be offered the opportunity to participate in the quality-of-life study
• NOTE: As a part of the 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.
• Participants must be informed of the investigational nature of this study and must sign and give informed consent in accordance with institutional and federal guidelines
• For participants with impaired decision-making capabilities, legally authorized representatives may sign and give informed consent on behalf of study participants in accordance with applicable federal, local, and Central Institutional Review Board (CIRB) regulations