Immunotherapy (Toripalimab) for Preventing Recurrence After Surgery for Mismatch Repair Deficient Stage IIB, IIC, or III Colon Cancer

Not Applicable

Not yet recruiting

• Conditions: Localized Colon Carcinoma; Stage IIB Colon Cancer AJCC v8; Stage IIC Colon Cancer AJCC v8; Stage III Colon Cancer AJCC v8
• Interventions: Procedure: Biopsy Procedure; Procedure: Biospecimen Collection; Procedure: Colonoscopy; Procedure: Computed Tomography; Other: Questionnaire Administration; Drug: Toripalimab

• Registration Number: NCT07140679
• Lead Sponsor: Emory University

Brief Summary

This phase II trial tests how well immunotherapy (toripalimab) works for preventing cancer recurrence after surgery in patients with mismatch repair deficient stage IIB, IIC, or III colon cancer.

Detailed Description

PRIMARY OBJECTIVE:

I. Evaluate the efficacy of adjuvant toripalimab in patients with resected stage IIB, IIC, and III mismatch repair deficient (dMMR) colon cancer by measuring 3-year disease-free survival.

SECONDARY OBJECTIVES:

I. Define the immune related toxicity profile of toripalimab in the adjuvant setting.

II. Further evaluate the efficacy of adjuvant toripalimab specifically by measuring 3-year relapse free survival (RFS), 5-year disease free survival (DFS), and 5-year overall survival.

TERTIARY/EXPLORATORY OBJECTIVES:

I. To explore immune, ctDNA, and omic markers associated with clinical efficacy (DFS).

II. To assess patient reported outcomes (PRO) and health related quality of life (QOL).

OUTLINE:

Eligible consenting patients receive toripalimab intravenously every 3 weeks for 6 months (8 doses) in the absence of disease recurrence or unacceptable toxicity.

Following this, patients undergo surveillance follow up with blood tests, computed tomography (CT) scans, colonoscopy at specified intervals until 5 years post-resection. After completion of study treatment, patients are followed up every 6 months until 5 years post-resection.

Study Timeline

• Status Verified: 2025-08
• Study First Submitted: 2025-08-22
• Study First Submitted QC: 2025-08-22
• Last Update Submitted: 2025-08-22
• Study First Posted: 2025-08-25
• Last Update Posted: 2025-08-25
• Study Start: 2025-09-08
• Primary Completion: 2029-09-30
• Study Completion: 2029-12-31

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 40

Inclusion Criteria

• Patients with resected pathologic stage IIB, IIC and III dMMR colon cancer (American Joint Committee on Cancer [AJCC] 8)

• Deficient mismatch repair (MMR) by immunohistochemistry or microsatellite instability (MSI-H) by polymerase chain reaction (PCR) or next generation sequencing (NGS)

• Complete (R0) resection of pathologic stage IIB, IIC and III dMMR colon cancer 4 to 12 weeks prior to first dose of study drug

• Available tissue sample from surgical specimen

• Eastern Cooperative Oncology Group (ECOG) performance status 0, 1, or 2

• Absolute neutrophil count (ANC) ≥ 1,500 /mcL

• Platelets ≥ 100,000 / mcL

• Hemoglobin ≥ 9 g/dL or ≥ 5.0 mmol/L

  • Transfusion is allowed to obtain an adequate hemoglobin level

• Creatinine ≤ 1.5 x upper limit of normal (ULN) or measured or calculated creatinine clearance ≥ 40 mL/min for patient with creatinine levels > 1.5 x institutional ULN (glomerular filtration rate [GFR] can also be used in place of creatinine or creatinine clearance [CrCl])

  • Creatinine clearance should be calculated per institutional standard

• Total bilirubin ≤ 1.5 x ULN or direct bilirubin ≤ ULN for patients with total bilirubin levels > 1.5 x ULN

  • Patients with previously diagnosed Gilbert syndrome can have total bilirubin < 3.0 mg/dL

• Aspartate aminotransferase (AST) (serum glutamic-oxaloacetic transaminase [SGOT]) and alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT]) ≤ 2.5 x ULN

• Alkaline phosphatase ≤ 2.5 x ULN

• Signed informed consent

• Patients at least 18 years of age

• Must have had a full colonoscopy prior to enrollment. If synchronous colon cancers are present, both must have deficient MMR and both must have undergone complete resection for patient to be eligible

• Women of child bearing potential (WOCBP) must have a negative serum (or urine) pregnancy test within 72 hours prior to the first dose of study treatment. WOCBP are women younger than 55 years (yrs) of age excluding those who are surgically unable to get pregnant due to prior hysterectomy and or bilateral salpingo-oophorectomy

• Patients of childbearing / reproductive potential should use adequate birth control methods, as defined by the investigator, during the study treatment period and for a period of 90 days after the last dose of study drug. A highly effective method of birth control is defined as those which result in low failure rate (i.e. less than 1% per year) when used consistently and correctly. Abstinence is acceptable if this is established and preferred contraception for the patient and is accepted as a local standard

• Female patients who are breast feeding should discontinue nursing prior to the first dose of study treatment and until 90 days after the last dose of study drug

Exclusion Criteria

• Neoadjuvant treatment for dMMR colon cancer
• Presence of metastatic dMMR colon cancer
• Underlying medical conditions that, in the investigator's opinion, will make the administration of the study drug hazardous or obscure the interpretation of adverse events
• Uncontrolled psychiatric illness or psychological condition potentially hampering compliance with the study protocol and follow-up schedule
• History of pneumonitis requiring treatment with steroids, or history of interstitial lung disease
• History of a hematologic or primary solid tumor malignancy within the last 5 years
• Autoimmune disease that has required systemic treatment in past 2 years (i.e. with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Replacement therapy (eg., thyroxine, insulin, or physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency, etc.) is not considered a form of systemic treatment. Patients with vitiligo, diabetes mellitus type 1, residual hypothyroidism due to autoimmune condition only requiring hormone replacement, controlled psoriasis or resolved childhood asthma/atopy not requiring systemic treatment can be enrolled
• Active hepatitis B or hepatitis C
• Systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment
• Treatment with live vaccines within 30 days prior to the first dose of study medication. Examples of live vaccines include, but are not limited to, the following: measles, mumps, rubella, chicken pox, yellow fever, nasal seasonal flu, H1N1 flu, rabies, Bacille Calmette Guerin (BCG) and typhoid vaccine
• Prior treatment with any immune checkpoint inhibitor
• Current pregnancy or breastfeeding

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Treatment (toripalimab)	Biopsy Procedure	Eligible consenting patients receive toripalimab intravenously every 3 weeks for 6 months (8 doses) in the absence of disease recurrence or unacceptable toxicity. Following this, patients undergo surveillance follow up with blood tests, computed tomography (CT) scans, colonoscopy at specified intervals until 5 years post-resection. For patients who have a recurrence, a biopsy will be performed at the time of recurrence.
Treatment (toripalimab)	Colonoscopy	Eligible consenting patients receive toripalimab intravenously every 3 weeks for 6 months (8 doses) in the absence of disease recurrence or unacceptable toxicity. Following this, patients undergo surveillance follow up with blood tests, computed tomography (CT) scans, colonoscopy at specified intervals until 5 years post-resection. For patients who have a recurrence, a biopsy will be performed at the time of recurrence.
Treatment (toripalimab)	Questionnaire Administration	Eligible consenting patients receive toripalimab intravenously every 3 weeks for 6 months (8 doses) in the absence of disease recurrence or unacceptable toxicity. Following this, patients undergo surveillance follow up with blood tests, computed tomography (CT) scans, colonoscopy at specified intervals until 5 years post-resection. For patients who have a recurrence, a biopsy will be performed at the time of recurrence.
Treatment (toripalimab)	Toripalimab	Eligible consenting patients receive toripalimab intravenously every 3 weeks for 6 months (8 doses) in the absence of disease recurrence or unacceptable toxicity. Following this, patients undergo surveillance follow up with blood tests, computed tomography (CT) scans, colonoscopy at specified intervals until 5 years post-resection. For patients who have a recurrence, a biopsy will be performed at the time of recurrence.
Treatment (toripalimab)	Biospecimen Collection	Eligible consenting patients receive toripalimab intravenously every 3 weeks for 6 months (8 doses) in the absence of disease recurrence or unacceptable toxicity. Following this, patients undergo surveillance follow up with blood tests, computed tomography (CT) scans, colonoscopy at specified intervals until 5 years post-resection. For patients who have a recurrence, a biopsy will be performed at the time of recurrence.
Treatment (toripalimab)	Computed Tomography	Eligible consenting patients receive toripalimab intravenously every 3 weeks for 6 months (8 doses) in the absence of disease recurrence or unacceptable toxicity. Following this, patients undergo surveillance follow up with blood tests, computed tomography (CT) scans, colonoscopy at specified intervals until 5 years post-resection. For patients who have a recurrence, a biopsy will be performed at the time of recurrence.

Primary Outcome Measures

Name	Time	Method
3-year Disease free survival (DFS)	Time between the date of registration and the first date of documented recurrence, regardless of discontinuation of study drug, or death due to any cause, assessed at 3 years	DFS will be estimated using the Kaplan-Meier method, and a 95% confidence interval for 3-year DFS rate will be reported using the Greenwood formula for estimating the standard error of the survival function.

Secondary Outcome Measures

Name	Time	Method
Incidence of treatment-related adverse events	Up to 5 years	Safety will be determined according to the National Cancer Institute Common Terminology Criteria for Adverse Events version 5. Treatment-related adverse events (defined as potentially, probably and definitely) will be summarized in preferred term by system organ class and listed on an individual subject basis at patient level. Immune-related adverse events will also be tabulated.
3-year Relapse free survival (RFS)	Time between the date of registration and the first date of documented disease recurrence, assessed at 3 years	RFS will be estimated using the Kaplan-Meier method, and a 95% confidence interval for 3-year RFS rate will be reported using the Greenwood formula for estimating the standard error of the survival function.
5-year DFS	Time between the date of registration and the first date of documented recurrence, regardless of discontinuation of study drug, or death due to any cause, assessed at 5 years	DFS will be estimated using the Kaplan-Meier method, and a 95% confidence interval for 5-year DFS rate will be reported using the Greenwood formula for estimating the standard error of the survival function.
Colon cancer specific survival (CCSC)	Time between the date of registration and the date of death due to colon cancer, assessed up to 5 years	CCSC will be estimated using the Kaplan-Meier method, and a 95% confidence interval for median CCSC will be estimated using the Brookmeyer-Crowley approach.
Overall survival (OS)	Time between the date of registration and the date of death due to any cause, assessed up to 5 years	OS will be estimated using the Kaplan-Meier method, and a 95% confidence interval for median OS will be estimated using the Brookmeyer-Crowley approach.

Trial Locations

Locations (5)

Emory Decatur Hospital; 🇺🇸 Atlanta, Georgia, United States

Emory University Hospital Midtown; 🇺🇸 Atlanta, Georgia, United States

Emory University Hospital/Winship Cancer Institute; 🇺🇸 Atlanta, Georgia, United States

Emory Saint Joseph's Hospital; 🇺🇸 Atlanta, Georgia, United States

Emory Johns Creek Hospital; 🇺🇸 Johns Creek, Georgia, United States