Last updated: 01/22/2026 07:20:15
Study of Perioperative Dostarlimab in Participants with Untreated T4N0 or Stage III dMMR/MSI-H Resectable Colon Cancer
GSK study ID
219606
Clinicaltrials.gov ID
EudraCT ID
Not applicable
EU CT Number
Trial status
Recruiting
Recruiting
Trial overview
Official title: A Phase 3, Open-Label, Randomized Study of Perioperative Dostarlimab Monotherapy versus Standard of Care in Participants with Untreated T4N0 or Stage III dMMR/MSI-H Resectable Colon Cancer
Trial description: The primary purpose of this study is to evaluate the efficacy of perioperative dostarlimab compared with standard of care (SOC) in participants with untreated T4N0 or Stage III (resectable), defective mismatch repair/ microsatellite instability high (dMMR/MSI-H) colon cancer.
Primary purpose:
Treatment
Trial design:
Parallel Assignment
Masking:
None (Open Label)
Allocation:
Randomized
Primary outcomes:
Event-free Survival (EFS) Assessed by Blinded Independent Central Review (BICR)
Timeframe: Up to approximately 5 years
Secondary outcomes:
Overall Survival (OS)
Timeframe: Up to approximately 5 years
Number of Participants with Pathological Response
Timeframe: Up to approximately 5 years
Event-free Survival (EFS) assessed by local assessment
Timeframe: Up to approximately 5 years
Number of Participants with treatment emergent adverse events (AEs), serious adverse events (SAEs), Immune-mediated Adverse Event (imAEs), AEs leading to death and AEs leading to discontinuation of study treatment
Timeframe: Up to approximately 5 years
Number of Participants with AEs and SAEs by Severity
Timeframe: Up to approximately 5 years
Serum Concentration of Dostarlimab
Timeframe: Predose and End of Infusion (EoI) of Cycle 1 and EoI of Cycle 2 to Cycle 10 (each cycle is of 21 days)
Serum Concentration of Dostarlimab at End of Infusion (C-EoI)
Timeframe: End of Infusion (EoI) of Cycle 1 to Cycle 10 (each cycle is of 21 days)
Serum Predose trough concentration (Ctrough) of Dostarlimab
Timeframe: Predose of Cycle 1 to Cycle 10 (each cycle is of 21 days)
Number of Participants with Anti-Drug Antibodies against Dostarlimab
Timeframe: Up to approximately 5 years
Interventions:
Biological/vaccine: Dostarlimab
Drug: CAPEOX
Drug: FOLFOX
Enrollment:
892
Observational study model:
Not applicable
Primary completion date:
2029-19-03
Time perspective:
Not applicable
Clinical publications:
Not applicable
Medical condition
Colonic Neoplasms
Product
Dostarlimab
Collaborators
Not applicable
Study date(s)
August 2023 to March 2031
Type
Interventional
Phase
3
Participation criteria
Sex
Female & Male
Age
18+ years
Accepts healthy volunteers
No
- Has untreated pathologically confirmed colon adenocarcinoma
- Has resectable colon adenocarcinoma defined as clinically T4N0 or Stage III
- Has distant metastatic disease.
- Has received prior medical therapy (chemotherapy, immunotherapy, biologic, or targeted therapy), radiation therapy or surgery for management of the current diagnosis of colon cancer
Inclusion and exclusion criteria
Inclusion criteria:
- Has untreated pathologically confirmed colon adenocarcinoma
- Has resectable colon adenocarcinoma defined as clinically T4N0 or Stage III
- Has radiologically evaluable disease
- Has a tumor demonstrating the presence of either dMMR status or MSI-H
Exclusion criteria:
- Has distant metastatic disease.
- Has received prior medical therapy (chemotherapy, immunotherapy, biologic, or targeted therapy), radiation therapy or surgery for management of the current diagnosis of colon cancer
- Has a tumor that, in the investigator’s judgment is causing symptomatic bowel obstruction or otherwise requires urgent/emergent surgery at the time of screening. Participants with a history of colonic obstruction are eligible after obstruction is relieved by a diverting stoma (defunctioning ileostomy or colostomy). Patients with a history of colonic obstruction in the context of current colon cancer diagnosis and treated with colonic stents are not eligible.
- Has undergone any major surgical procedure, open biopsy, or experienced significant traumatic injury within 28 days prior to randomization
- Has any history of interstitial lung disease or pneumonitis and/or history of radiation induced enteritis.
- Has cirrhosis or current unstable liver or biliary disease per investigator assessment defined by the presence of ascites, encephalopathy, coagulopathy, hypoalbuminemia, esophageal/gastric varices, or persistent jaundice
- Has a history of allogenic stem cell transplantation or organ transplantation
- Is receiving any other anticancer or experimental therapy. No other experimental therapies (including but not limited to chemotherapy, radiation, hormonal treatment, antibody therapy, immunotherapy, gene therapy, vaccine therapy, or other experimental drugs) of any kind are permitted while the participant is receiving study intervention
- Is pregnant, breastfeeding, or expecting to conceive children within the projected duration of the study
- Has a history of severe allergic and/or anaphylactic reactions to chimeric, human or humanized antibodies, fusion proteins, or known allergies to dostarlimab, or its excipients, or any components of FOLFOX or CAPEOX
Trial location(s)
Location
GSK Investigational Site
London, United Kingdom, SW3 6JJ
2.2 miles (3.5 km) away from your location
Status
Recruiting
Location
GSK Investigational Site
London, United Kingdom, NW3 2QG
3.6 miles (5.8 km) away from your location
Status
Recruiting
Location
GSK Investigational Site
Sutton, United Kingdom, SM2 5PT
11.6 miles (18.6 km) away from your location
Status
Recruiting
Location
GSK Investigational Site
Chelmsford, United Kingdom, CM1 7ET
31.5 miles (50.4 km) away from your location
Status
Recruiting
Study documents
No study documents available.
Results overview
Study Results yet to be posted
Recruitment status
Recruiting
Actual primary completion date
Not applicable
Actual study completion date
Not applicable
Plain language summaries
Plain language summaries of clinical trial results for Phase 2-4 clinical trials that were initiated on or after January 2022 will be posted by GSK within one year following study completion.
Additional information about the trial
Additional information
Not applicable
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