for people ages 18 years and up (full criteria)
at San Francisco, California and other locations
study started
completion around
Principal Investigator
by Aparajita Singh
Headshot of Aparajita Singh
Aparajita Singh



This phase IIb trial tests whether Tri-Ad5 in combination with N-803 works to prevent colon and other cancers in participants with Lynch syndrome. Each of the three injections in Tri-Ad5 vaccine contain a different substance that is in precancer and cancer cells. Injecting these substances may cause the immune system to develop a defense against cancer that recognizes and destroys any precancer and cancer cells that produce these proteins in the future. N-803 may increase immune responses to other vaccines. Giving Tri-Ad5 in combination with immune enhancing N-803 may lower the chance of developing colon and other cancers in participants with Lynch syndrome.

Official Title

A Phase IIB Clinical Trial of the Multitargeted Recombinant Adenovirus 5 (CEA/MUC1/Brachyury) Vaccine (TRI-AD5) and IL-15 Superagonist N-803 in Lynch Syndrome



  1. To evaluate if the combination of trivalent adenovirus-5 (Tri-Ad5) vaccines and IL-15 superagonist nogapendekin alfa inbakicept (N-803) reduces the incidence of colorectal neoplasms in patients with Lynch syndrome (LS).


  1. To evaluate the safety and tolerability of the Tri-Ad5 vaccines + N-803 in combination.

II. To correlate clinical factors such as use of aspirin and non-steroidal anti-inflammatory drugs (NSAID), smoking and alcohol intake with immune responses.

III. To evaluate the effect of Tri-Ad5 vaccines on the incidence of LS-related extracolonic cancers.

IV. To systematically measure the participants' behavior and experience in terms of vaccine uptake, cancer-specific distress and quality of life.


  1. To determine the ability of the Tri-Ad5 vaccines + N-803 to generate a 2-fold increase in T cell responses (cell-mediated immunity) at week 12 (early immune response) and at week 56 (long-term memory response).

II. To evaluate circulating anti-MUC1 IgG (antibody-mediated immunity) after Tri-Ad5 vaccines + N-803.

III. To compare the expression of the three tumor associated antigen (TAAs): MUC1, carcinoembryonic antigen (CEA) and brachyury in colorectal neoplasms before and after Tri-Ad5 vaccines + N-803.

IV. To evaluate changes in the immune profile and abundance of resident immune cell types in colonic mucosa after vaccination with Tri-Ad5 vaccines + N-803 using messenger ribonucleic acid sequencing (mRNAseq) and immunohistochemistry (IHC).

  1. To test the effects of the vaccines alone or in combination with N-803 on specific immune subsets of peripheral blood mononuclear cells (PBMCs) and serum soluble factors and cytokines.

VI. To compare the expression of stem cell markers in colorectal neoplasms before and after Tri-Ad5 vaccines + N-803.


SAFETY PHASE I: Participants receive Tri-Ad5 subcutaneously (SC) at weeks 0, 4, 8, and 52. Participants also undergo standard of care (SOC) colonoscopy with biopsy at baseline, at 52 weeks and 104 weeks.

SAFETY PHASE II: Participants receive Tri-Ad5 SC and N-803 SC at weeks 0, 4, 8, and 52. Participants also undergo SOC colonoscopy with biopsy at baseline, 52 weeks and 104 weeks.

RANDOMIZED CONTROL PHASE: Participants are randomized into 1 of two arms.

ARM I: Participants receive Tri-Ad5 SC and N-803 SC at weeks 0, 4, 8, and 52. Participants also undergo SOC colonoscopy with biopsy at baseline and at 52 and 104 weeks.

ARM II: Participants receive placebo SC at weeks 0, 4, 8, and 52. Participants also undergo SOC colonoscopy with biopsy at baseline and at 52 and 104 weeks.

Participants undergo blood sample collection throughout the study.


Lynch Syndrome, Hereditary Nonpolyposis Colorectal Neoplasms, Syndrome, Vaccines, Adenovirus 5 CEA/MUC1/Brachyury Vaccine Tri-Ad5, Biopsy, Biospecimen Collection, Colonoscopy, Nogapendekin Alfa, Tri-Ad5, N-803


You can join if…

Open to people ages 18 years and up

  • Participants with LS defined as one of the following:
    • Mutation positive: MLH1, MSH2/EPCAM and MSH6 genotypes with prior history of >= 1 adenoma(s) and/or >= 1 advanced adenoma(s) and/or colon cancer(s) (but no active cancer for 6 months) OR
    • PMS2 genotype with prior history of colon cancer(s) (but no active cancer for 6 months)
  • Participants must have at least part of the descending/sigmoid colon and/or rectum intact
  • Participants must be at least 6 months from any cancer-directed treatment (such as surgical resection, chemotherapy, immunotherapy or radiation)
  • Participants >= 18 years will be enrolled. Because the risk of LS related cancers is very low in participants < 18 years of age, children and adolescents are excluded from this study
  • Eastern Cooperative Oncology Group (ECOG) performance status =< 1 (Karnofsky >= 70%)
  • Leukocytes >= 3,000/microliter
  • Absolute neutrophil count >= 1,500/microliter
  • Platelets >= 100,000/microliter
  • Total bilirubin within normal institutional limits
  • Aspartate aminotransferase (AST) (serum glutamic-oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT]) =< 1.5 x institutional upper limit of normal
  • Creatinine within normal institutional limits
  • The effects of the Tri-Ad5 vaccines and N-803 on the developing human fetus at the recommended therapeutic dose are unknown. For this reason, 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 and 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 study physician immediately
  • Ability to understand and the willingness to sign a written informed consent document
  • Participants must be willing and able to space coronavirus disease (COVID) vaccines at least 2 weeks prior to and 2 weeks after receipt of study agent

You CAN'T join if...

  • History of organ allograft or other history of immunodeficiency
  • Known human immunodeficiency virus (HIV) with CD4 count < 540, hepatitis B virus (HBV), or hepatitis C virus (HCV) infection. Subjects with laboratory evidence of cleared HBV and HCV infection will be permitted. Poorly controlled HIV may prevent an adequate immune response to the vaccine and will be an exclusion criterion
  • Subjects requiring systemic treatment with corticosteroids (> 10 mg daily prednisone equivalents) or other immunosuppressive medications within 3 months of vaccination
  • Participants may not be receiving any other investigational agents
  • History of allergic reactions attributed to compounds of similar chemical or biologic composition to adenovirus-based vaccines and N-803
  • Uncontrolled intercurrent illness or psychiatric illness/social situations that would limit compliance with study requirements
  • Pregnant women are excluded from this study because of the unknown effects of the vaccine and N-803 on the fetus. Because there is an unknown but potential risk for adverse events (AEs) in nursing infants secondary to treatment of the mother with the vaccine plus N-803, breastfeeding should be discontinued if the mother is treated with the vaccine plus N-803
  • History of untreated thrombotic disorders
  • Participants who experienced severe side effects or allergic reactions to previous adenovirus-based vaccines (such as Johnson and Johnson COVID vaccine) will be excluded


  • UCSF Medical Center-Parnassus accepting new patients
    San Francisco California 94143 United States
  • Mayo Clinic Hospital in Arizona not yet accepting patients
    Phoenix Arizona 85054 United States
  • University of Arizona Cancer Center - Prevention Research Clinic accepting new patients
    Tucson Arizona 85719 United States

Lead Scientist at UCSF

  • Aparajita Singh
    Dr Singh is a board certified gastroenterologist with special interest in colon cancer prevention, high quality colonoscopy. Her other interests include patients with high risk for colon cancer with Lynch Syndrome, FAP and management of patients with a family history of colorectal cancers.


accepting new patients
Start Date
Completion Date
National Cancer Institute (NCI)
Phase 2 research study
Study Type
Expecting 186 study participants
Last Updated