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Protocol Details

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)

This study is currently recruiting participants.

Summary | Eligibility | Citations | Contacts




Sponsoring Institute

National Cancer Institute (NCI)

Recruitment Detail

Type: Participants currently recruited/enrolled
Gender: Male & Female
Min Age: 18 Years
Max Age: 120 Years

Referral Letter Required


Population Exclusion(s)

Pregnant Women


Monoclonal Antibody;
Immunoglobulin G cytokine fusion protein;
chemokine antagonist;
Small Molecule

Recruitment Keyword(s)



Metastatic colorectal cancer

Investigational Drug(s)

Retifanlimab (MGA 012)

Investigational Device(s)



Drug: Retifanlimab
Biological/Vaccine: Therapeutic CEA, Brachyury and MUC1 TriAdeno Vaccine Platform
Drug: N-803
Drug: SX-682

Supporting Site

National Cancer Institute


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.


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.


Adults aged 18 years or older with mCRC. Participants must have


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.

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-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.

-Women of child-bearing potential (WOCBP) and men 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.


-Participants with prior investigational drug, chemotherapy, immunotherapy, or any prior therapeutic radiotherapy within 14 days prior to study treatment initiation.

-Participants with palliative radiotherapy performed within 7 days prior to study treatment initiation.

-Active autoimmune disease requiring systemic immunosuppression in excess of physiologic maintenance doses of corticosteroids (> 10 mg/day of prednisone or equivalent) with the exception of:

--intermittent use of bronchodilators, inhaled corticosteroids, or local corticosteroid injections in participants with asthma

--using topical, ocular, intra-articular, or intranasal corticosteroids (with minimal systemic absorption

--brief courses of corticosteroids for prophylaxis (e.g., contrast dye allergy).

-Evidence of interstitial lung disease, history of interstitial lung disease, or active, noninfectious pneumonitis. Participants with chronic post-radiation pulmonary changes/scarring that is asymptomatic are eligible.

-Active infections requiring systemic antibiotics or antifungal or antiviral treatment within 8 days prior to treatment initiation. Participants who have had appropriate antibiotics initiated but are still completing the treatment course are eligible if clinically improved or had minimal symptoms at presentation (e.g., urinary tract infection or pharyngeal streptococcal infection without evidence of systemic inflammatory response).

--History of organ transplant, including allogeneic stem cell transplantation.

--Participants who experienced immune-related toxicity during prior checkpoint inhibitor therapy for which permanent discontinuation of therapy was recommended (per product label or consensus guidelines) or any immune-related toxicity requiring systemic corticosteroids (with the exception of endocrinopathy that is well controlled on replacement hormones).

-History of allergic reactions attributed to compounds of similar chemical or biologic composition to the study drugs.

-Receipt of a live vaccine within 28 days prior to treatment initiation. Note: Examples of live vaccines include but are not limited to measles, mumps, rubella, varicella-zoster (chickenpox), yellow fever, rabies, BCG, and typhoid vaccines. Seasonal influenza vaccines for injection are generally killed-virus vaccines and are allowed; however, intranasal influenza vaccines are live, attenuated vaccines and are not allowed.

-History of infection with Hepatitis B virus (HBV) unless on suppressive therapy. Individuals with serologic evidence of a resolved prior HBV infection (i.e., HBsAgnegative and anti-HBc positive) are eligible.

-Pregnancy confirmed with Beta-human chorionic gonadotropin (Beta-HCG) serum or urine pregnancy test performed in WOCBP at screening.

-Uncontrolled intercurrent illness that would limit compliance with study requirements.

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Not Provided

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Principal Investigator

Referral Contact

For more information:

Jason M. Redman, M.D.
National Cancer Institute (NCI)

NCI Referral Office
National Cancer Institute (NCI)
National Institute of Health Clinical Center (CC), 9000 Rockville Pike, Bethesda, Maryland 20892, United States: NCI Clinical Trials Referral Office

NCI Referral Office
National Institute of Health Clinical Center (CC), 9000 Rockville Pike, Bethesda, Maryland 20892, United States: NCI Clinical Trials Referral Office

Clinical Trials Number:


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