Phase I/II Study of the Combination Immunotherapy Regimen: SX-682, TriAdeno Vaccine, Retifanlimab and IL-15 Agonist N-803 (STAR15) for Metastatic Colorectal Cancer (mCRC)
Background: Each year, more than 32,000 people in the United States are diagnosed with colorectal cancer that has returned or progressed after treatment and spread to other organs. This is called metastatic colorectal cancer (mCRC). Most people with mCRC survive only about 2 years.
Objective: To test the ability of a combination of up to 4 experimental anti-cancer drugs treat mCRC. The names of these drugs are retifanlimab, TriAdeno vaccine, N-803, and SX-682. They are described below.
Eligibility: Adults aged 18 years or older with mCRC. Participants must have
Design: Participants will be screened. This includes having a physical exam, blood tests, urine tests, and imaging tests. If signed on to the study, participants will have 2 tumor biopsies. One when starting the study and once about 8 weeks after bring on the study. Participants will receive $500 for each biopsy. Participants will be treated with either 3 or 4 drugs and will receive a detailed calendar explaining when each drug is given. Retifanlimab is given every 4 weeks through an IV (an IV is tube attached to a needle inserted into a vein in the arm). N-803 is injected under the skin on the abdomen every 4 weeks. TriAdeno vaccine is injected under the skin of the upper arm or thigh once a month for 3 doses and then once every 3 months. Some participants will also receive a 4th drug. SX-682 is a pill taken by mouth. Participants will take this drug 2 times a day at home for about 3 weeks of each month. Study treatment will continue up to 2 years. Follow-up phone calls/emails may continue for 3 more years. ...
• Participants with histologically confirmed colorectal cancer and evidence of metastatic disease.
• Participants must have received, been ineligible to receive, or refused to receive two lines of standard systemic therapy i.e., a fluoropyrimidine with oxaliplatin or irinotecan with bevacizumab, regorafenib, trifluridine, and (if history of RAS wild-type) EGFR-targeted therapy. Participants must have received one line of systemic checkpoint inhibitor if history of advanced microsatellite instability-high \[MSI-H/dMMR\]) metastatic colon cancer.
• Participants who had progressive disease within 6 months before study treatment following standard adjuvant therapy are eligible if they have not received systemic therapy for metastatic disease. Participants with a history of MSI-H/dMMR must have also received one line of checkpoint inhibitor therapy.
• Age \>= 18 years.
• Measurable disease per RECIST 1.1.
• ECOG performance status \<= 2.
• Adequate organ and marrow as a function defined below:
‣ absolute neutrophil count (ANC) \>= 1,500 cells/mm\^3
⁃ platelet count \>= 100,000 cells/mm\^3
⁃ hemoglobin (Hgb) \>= 9 g/dL
⁃ total bilirubin level \< 1.5 x upper limit of normal (ULN)
⁃ alanine aminotransferase (ALT) \<= 2.5 x ULN OR \<= 5 x ULN for participants with liver metastases
⁃ aspartate aminotransferase (AST) level \<= 2.5 x ULN OR \<= 5 x ULN for participants with liver metastases
⁃ creatinine clearance (CrCl) calculated by Cockroft-Gault formula \>= 50 mL/min
• Resolution of toxic effect(s) of prior anti-cancer therapy (except alopecia and neuropathy) to Grade \<=1 or to \<=2 if effective medical management of those toxicities is in place such that they are controlled per standard of care (e.g., grade 2 hypothyroidism requiring oral thyroid replacement).
• Participants with treated brain metastases are eligible if clinically appropriate follow-up brain imaging after central nervous system (CNS)-directed therapy shows no evidence of progression.
• Participants positive for human immunodeficiency virus (HIV) are eligible if they are compliant with appropriate anti-retroviral therapy for at least 6 months, have HIV viral load \<400 copies/mL, and a CD4 count \> 350 cells/microliter at screening.
• Participants positive for Hepatitis C virus (HCV) are eligible if they have completed definitive anti-viral therapy and have an undetectable viral load.
• Individuals of child-bearing potential (IOCBP) and individuals who can father children must agree to use an effective method of contraception (barrier, hormonal, intrauterine device \[IUD\], surgical sterilization) at study entry and up to 6 months after the last dose of the study drug(s).
• Breastfeeding participants must be willing to discontinue breastfeeding from study treatment initiation through 6 months after study treatment discontinuation.
• Participants must have lesion(s) accessible for biopsy (other than used for measurement of disease) and be willing to undergo mandatory study biopsies. Lesions to be biopsied will be determined safely accessible by the provider performing the biopsy (e.g. interventional radiology if a liver or lung biopsy) prior to performing the biopsy.
• Participants must be able to understand and willing to sign a written informed consent document.