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Study of Pembrolizumab (MK-3475) Plus Chemotherapy Versus Placebo Plus Chemotherapy in Participants With Gastric or Gastroesophageal Junction (GEJ) Adenocarcinoma (MK-3475-585 / KEYNOTE-585)

Trial Status: Active

The purpose of this study is to evaluate the efficacy of pembrolizumab (MK-3745) in the neoadjuvant (prior to surgery) or adjuvant (after surgery) treatment of previously untreated adults with gastric and gastroesophageal junction (GEJ) adenocarcinoma. The primary study hypotheses are that: - Neoadjuvant and adjuvant pembrolizumab plus chemotherapy, followed by adjuvant pembrolizumab is superior to neoadjuvant and adjuvant placebo plus chemotherapy, followed by adjuvant placebo in terms of Overall Survival (OS), and Event-free Survival (EFS) based on Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1), and - Neoadjuvant pembrolizumab plus chemotherapy is superior to neoadjuvant placebo plus chemotherapy in terms of rate of Pathological Complete Response (pathCR) at the time of surgery.

Inclusion Criteria

  • Has previously untreated localized gastric or GEJ adenocarcinoma as defined by T3 or greater primary lesion or the presence of any positive nodes - N+ (clinical nodes) without evidence of metastatic disease.
  • Plans to proceed to surgery following pre-operative chemotherapy based on standard staging studies per local practice.
  • Is willing to provide tissue from a tumor lesion at baseline and at time of surgery.
  • Has an Eastern Cooperative Oncology Group (ECOG) performance status score of 0 to 1 within 3 days prior to the first dose of study treatment.
  • Has adequate organ function.
  • Male participants of childbearing potential must agree to use an adequate method of contraception for the course of the study through 180 days after the last dose of chemotherapy.
  • Female participants of childbearing potential must be willing to use an adequate method of contraception for the course of the study through 180 days after the last dose of chemotherapy or through 120 days after the last dose of pembrolizumab, whichever is greater.
  • Has life expectancy of greater than 6 months.

Exclusion Criteria

  • Has a history of (non-infectious) pneumonitis that required steroids or has current pneumonitis.
  • Has an active infection requiring systemic therapy.
  • Is currently participating in or has participated in a trial of an investigational agent or has used an investigational device within 4 weeks prior to the first dose of study treatment.
  • Has received prior therapy with an anti-programmed cell death protein-1 (anti-PD-1), anti-programmed cell death-ligand 1 (anti-PD-L1), or anti-PD-L2 agent or with an agent directed to another stimulatory or co-inhibitory T-cell receptor (i.e., cytotoxic T-lymphocyte-associated protein 4 [CTLA-4], tumor necrosis factor receptor superfamily member 4 [OX-40], necrosis factor receptor superfamily member 9 [CD137]) or has previously participated in a Merck pembrolizumab (MK-3475) clinical trial.
  • Has received prior systemic anti-cancer therapy including investigational agents for the current malignancy.
  • 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 14 days prior the first dose of study treatment.
  • Has a known additional malignancy that is progressing or has required active treatment within the past 5 years. Note: Participants with basal cell carcinoma of the skin, squamous cell carcinoma of the skin, or carcinoma in situ that have undergone potentially curative therapy are not excluded.
  • Has a known severe hypersensitivity (≥ Grade 3) to pembrolizumab, its active substance and/or any of its excipients, or to any of the study chemotherapy agents and/or to any of their excipients.
  • Has an active autoimmune disease that has required systemic treatment in past 2 years.
  • Has a known history of human immunodeficiency virus (HIV) infection.
  • Has a known history of Hepatitis B or known active Hepatitis C virus infection.
  • Has a known history of active tuberculosis (TB).
  • Female participants who are pregnant or breastfeeding or expecting to conceive children within the projected duration of the study, starting with the screening visit through180 days after the last dose of chemotherapy or through 120 days after the last dose of pembrolizumab, whichever is greater.
  • Male participants who are expecting to father children within the projected duration of the study, starting with the screening visit through 180 days after the last dose of chemotherapy.
  • Has had an allogenic tissue/solid organ transplant.
  • Has received a live vaccine within 30 days prior to the first dose of study treatment.

California

Duarte
City of Hope Comprehensive Cancer Center
Status: ACTIVE

Connecticut

New Haven
Yale University
Status: ACTIVE
Contact: Kamil Sadowski
Phone: 203-785-6661

District of Columbia

Washington
MedStar Georgetown University Hospital
Status: ACTIVE

Illinois

Chicago
Northwestern University
Status: ACTIVE
University of Chicago Comprehensive Cancer Center
Status: IN_REVIEW

New York

Buffalo
Roswell Park Cancer Institute
Status: ADMINISTRATIVELY_COMPLETE
New York
Laura and Isaac Perlmutter Cancer Center at NYU Langone
Status: ACTIVE
Memorial Sloan Kettering Cancer Center
Status: WITHDRAWN
Contact: David Herman Ilson
Phone: 646-888-4183

Pennsylvania

Philadelphia
Fox Chase Cancer Center
Status: CLOSED_TO_ACCRUAL_AND_INTERVENTION

Utah

Salt Lake City
Huntsman Cancer Institute / University of Utah
Status: COMPLETED

Trial Phase Phase III

Trial Type Treatment

Lead Organization
Merck and Company Inc

  • Primary ID 3475-585
  • Secondary IDs NCI-2017-01580, KEYNOTE-585, 2016-004408-76, MK-3475-585, 173786, PHRR200226-002534
  • Clinicaltrials.gov ID NCT03221426