Study of Pembrolizumab (MK-3475) Versus Chemotherapy in Chinese Participants With Stage IV Colorectal Cancer (MK-3475-C66)

  • End date
    Nov 10, 2026
  • participants needed
  • sponsor
    Merck Sharp & Dohme LLC
Updated on 4 July 2022


In this study, Chinese participants with MSI-H or dMMR advanced colorectal cancer will be assigned to receive either pembrolizumab or the Investigator's choice of 1 of 6 standard of care (SOC) chemotherapy regimens for treatment. There is no hypothesis for this study.

Condition Colorectal Neoplasms
Treatment Cetuximab, bevacizumab, Pembrolizumab, Irinotecan, Oxaliplatin, Leucovorin, 5-fluorouracil
Clinical Study IdentifierNCT05239741
SponsorMerck Sharp & Dohme LLC
Last Modified on4 July 2022


Yes No Not Sure

Inclusion Criteria

Has a histologically confirmed diagnosis of colorectal adenocarcinoma that is at stage IV (as defined by American Joint Committee on Cancer eighth edition) [National Comprehensive Cancer Network 2018]
Has centrally confirmed MSI-H/dMMR status
Has centrally confirmed RAS and BRAF mutation status
A woman of child-bearing potential (WOCBP) must have a negative highly sensitive pregnancy test (urine or serum as required by local regulations) within 24 hours for urine or within 72 hours for serum before the first dose of study intervention
Has measurable disease per RECIST 1.1 as assessed by the local site investigator/radiology
Must provide an archival tumor tissue sample or newly obtained core or excisional biopsy of a tumor lesion not previously irradiated
Has an Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1 within 3 days before randomization
Has a life expectancy of at least 3 months

Exclusion Criteria

Has received prior systemic therapy for stage IV colorectal cancer (CRC). Participants may have received prior adjuvant/neoadjuvant chemotherapy for CRC as long as it was completed at least 6 months prior to randomization
Has undergone major operation within 4 weeks of randomization or has not recovered adequately from the procedure and/or any complications from any operation prior to randomization
Has received prior therapy with an anti-PD-1, anti-PD-L1, or anti PD-L2 agent or with an agent directed to another stimulatory or coinhibitory T-cell receptor (eg, cytotoxic T-lymphocyte-associated protein 4 [CTLA-4], tumor necrosis factor receptor superfamily, member 4 [OX 40], tumor necrosis factor receptor superfamily member 9 [CD137])
Has received prior radiotherapy within 2 weeks of start of study intervention
Has received a live or live-attenuated vaccine within 30 days before the first dose of study intervention
Is currently participating in or has participated in a study of an investigational agent or has used an investigational device within 4 weeks before the first dose of study intervention
Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication
Has a known additional malignancy that is progressing or has required active treatment within the past 5 years, with the exception of basal cell carcinoma of the skin, squamous cell carcinoma of the skin, or carcinoma in situ (eg, breast carcinoma, cervical cancer in situ) that have undergone potentially curative therapy are not excluded
Has known active central nervous system (CNS) metastases and/or carcinomatous meningitis
Has severe hypersensitivity (≥Grade 3) to pembrolizumab and/or any of its excipients
Has an active autoimmune disease that has required systemic treatment in past 2 years
Has a history of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease
Has an active infection requiring systemic therapy (eg, tuberculosis, known viral or bacterial infection)
Has a known history of human immunodeficiency virus (HIV) infection
Has a known history of Hepatitis B or known Hepatitis C virus infection
Has had an allogenic tissue/solid organ transplant
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