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​A Phase III, Randomized, Double-Blind, Clinical Trial of Pembrolizumab (MK-3475) Plus Chemotherapy (XP or FP) Versus Placebo Plus Chemotherapy (XP or FP) as Neoadjuvant/Adjuvant Treatment for Subjects With Gastric and Gastroesophageal Junction (GEJ) Adenocarcinoma (KEYNOTE-585)

Status
Completed
Phases
Phase 3
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2023-509595-42-00
Acronym
MK-3475-585
Enrollment
297
Registered
2024-05-31
Start date
2017-10-31
Completion date
2025-04-23
Last updated
2025-05-02

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Gastric and gastroesophageal junction (GEJ) adenocarcinoma

Brief summary

Event-free Survival (EFS) Per Response Criteria in Solid Tumors Version 1.1 (RECIST 1.1) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms, Pathological Complete Response (pathCR) Rate - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms, Overall Survival (OS) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms, Percentage of Participants Who Experience One or More Adverse Events (AEs) - Pembrolizumab+FLOT and Placebo+FLOT Cohorts, Percentage of Participants Who Discontinue Study Treatment Due to an Adverse Event (AE) - Pembrolizumab+FLOT and Placebo+FLOT Cohorts

Detailed description

Percentage of Participants Who Experience One or More Adverse Events (AEs) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms Separately and in Combination with the Pembrolizumab+FLOT and Placebo+FLOT Cohorts, Percentage of Participants Who Discontinue Study Treatment Due to an Adverse Event (AE) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms Separately and in Combination with the Pembrolizumab+FLOT and Placebo+FLOT Cohorts, Disease-free Survival (DFS) Per Response Criteria in Solid Tumors Version 1.1 (RECIST 1.1) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms, Overall Survival (OS) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms and Pembrolizumab+FLOT and Placebo+FLOT Cohorts, Event-free Survival (EFS) Per Response Criteria in Solid Tumors Version 1.1 (RECIST 1.1) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms and Pembrolizumab+FLOT and Placebo+FLOT Cohorts

Interventions

DRUGOXALIPLATIN
DRUGCAPECITABINE
DRUGCALCIUM FOLINATE
DRUGFLUOROURACIL
DRUGCISPLATIN
DRUGKEYTRUDA 25 mg/mL concentrate for solution for infusion
DRUGDOCETAXEL

Sponsors

Merck Sharp & Dohme LLC
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
All
Age
18 Years to 64 Years

Design outcomes

Primary

MeasureTime frame
Event-free Survival (EFS) Per Response Criteria in Solid Tumors Version 1.1 (RECIST 1.1) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms, Pathological Complete Response (pathCR) Rate - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms, Overall Survival (OS) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms, Percentage of Participants Who Experience One or More Adverse Events (AEs) - Pembrolizumab+FLOT and Placebo+FLOT Cohorts, Percentage of Participants Who Discontinue Study Treatment Due to an Adverse Event (AE) - Pembrolizumab+FLOT and Placebo+FLOT Cohorts

Secondary

MeasureTime frame
Percentage of Participants Who Experience One or More Adverse Events (AEs) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms Separately and in Combination with the Pembrolizumab+FLOT and Placebo+FLOT Cohorts, Percentage of Participants Who Discontinue Study Treatment Due to an Adverse Event (AE) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms Separately and in Combination with the Pembrolizumab+FLOT and Placebo+FLOT Cohorts, Disease-free Survival (DFS) Per Response Criteria in Solid Tumors Version 1.1 (RECIST 1.1) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms, Overall Survival (OS) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms and Pembrolizumab+FLOT and Placebo+FLOT Cohorts, Event-free Survival (EFS) Per Response Criteria in Solid Tumors Version 1.1 (RECIST 1.1) - Pembrolizumab+Chemotherapy and Placebo+Chemotherapy Treatment Arms and Pembrolizumab+FLOT and Placebo+FLOT Cohorts

Countries

Belgium, Estonia, France, Germany, Italy, Latvia, Lithuania, Poland

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026