Substudy 06C: A Study of Investigational Agents With Pembrolizumab (MK-3475) and Chemotherapy in Participants With First-Line Locally Advanced Unresectable/Metastatic Gastroesophageal Adenocarcinoma (MK-3475-06C/KEYMAKER-U06)

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This is not medical advice. AI-assisted translation — inaccuracies may occur. Always verify the original and consult your oncologist before taking any steps.

About the trial

This is a phase 1/2, multicenter, open-label umbrella platform study that will evaluate the safety and tolerability of investigational agents with pembrolizumab and fluoropyrimidine chemotherapy for the first-line (1L) treatment of participants with locally advanced unresectable or metastatic human epidermal growth factor receptor 2 (HER2)-negative gastric, gastroesophageal junction, or esophageal adenocarcinoma. This substudy will have two phases: a safety lead-in phase and an efficacy phase. The safety lead-in phase will be used to evaluate the safety and tolerability, and to establish a recommended Phase 2 dose (RP2D) for investigational agents in combination with chemotherapy and immunotherapy. There is no formal hypothesis in this study.

Original English text from ClinicalTrials.gov

Who can (and can't) join

✓ Qualifies

  • Potwierdzona diagnoza raka żołądka, połączenia żołądka i przełyku lub przełyku, który nie rozprzestrzenia się na inne organy (lub rozprzestrzenia się, ale nie można go usunąć chirurgicznie)
  • Nowotwór bez markerów HER2 (potwierdzone badaniem laboratoryjnym)
  • Wcześnie pobrana próbka tkanki nowotworowej do badań
  • Odporność organizmu wystarczająca do tolerowania leczenia (wydolność organów)
  • Możliwość mierzenia rozmiaru nowotworu za pomocą badań obrazowych
  • Ogólny stan zdrowia pozwalający na uczestnictwo w badaniu (skala ECOG 0-1)
  • Spodziewana długość życia co najmniej 6 miesięcy
  • Jeśli pacjent ma hepatitę B lub C albo HIV - muszą być kontrolowane odpowiednim leczeniem

✗ Disqualifies

  • Rak o budowie płaskonaborenkowej lub niezróżnicowanej

Simplified criteria — AI translation

Trial details

Minimum age
18 Years
Last updated (source)
August 7, 2026
Sex
No restrictions

Therapies / drugs in trial

Locations (51)

University of Arizona Cancer Center-University of Arizona Cancer Center ( Site 6927)

Tucson, United States

UCLA Hematology/Oncology - Santa Monica ( Site 6905)

Los Angeles, United States

Norton Hospital-Norton Cancer Institute - Downtown ( Site 6900)

Louisville, United States

The Cancer and Hematology Centers ( Site 6912)

Grand Rapids, United States

Hematology-Oncology Associates of Central NY, P.C. ( Site 6925)

East Syracuse, United States

Columbia University Irving Medical Center-CUIMC Herbert Irving Comprehensive Cancer Center Clinical ( Site 6907)

New York, United States

UPMC Hillman Cancer Center-UPMC ( Site 6904)

Pittsburgh, United States

University of Texas MD Anderson Cancer Center ( Site 6920)

Houston, United States

Liga Norte Riograndense Contra o Câncer ( Site 6303)

Natal, Brazil

Hospital Nossa Senhora da Conceição ( Site 6301)

Porto Alegre, Brazil

ICESP - INSTITUTO DO CÂNCER DO ESTADO DE SÃO PAULO ( Site 6300)

São Paulo, Brazil

IBCC - Instituto Brasileiro de Controle do Câncer ( Site 6304)

São Paulo, Brazil

Clínica Puerto Montt ( Site 6409)

Port Montt, Chile

Centro de Investigación del Maule ( Site 6408)

Talca, Chile

FALP-UIDO ( Site 6400)

Santiago, Chile

Centro de Oncología de Precisión-Oncology ( Site 6404)

Santiago, Chile

Clínica UC San Carlos de Apoquindo ( Site 6405)

Santiago, Chile

Bradfordhill-Clinical Area ( Site 6401)

Santiago, Chile

Bradford Hill Norte ( Site 6407)

Antofagasta, Chile

Beijing Cancer hospital-Digestive Oncology ( Site 5500)

Beijing, China

The 900th Hospital of the Joint Logistics Support Force of the Chinese People's Liberation Army ( Site 5501)

Fuzhou, China

The First Affiliated hospital of Xiamen University ( Site 5503)

Xiamen, China

Henan Cancer Hospital ( Site 5504)

Zhengzhou, China

The First Affiliated Hospital of Nanchang University ( Site 5514)

Nanchang, China

Fudan University Shanghai Cancer Center ( Site 5513)

Shanghai, China

Xinjiang Medical University Cancer Hospital - Urumqi ( Site 5506)

Ürümqi, China

Sir Run Run Shaw Hospital of Zhejiang University School of Medicine ( Site 5510)

Hangzhou, China

CHU-BREST Cavale Blanche ( Site 5104)

Brest, France

CIC. ( Site 5100)

Lille, France

Pitie Salpetriere University Hospital-Hepato-Gastro-Enterology ( Site 5102)

Paris, France

NCT-Department of Medical Oncology ( Site 6809)

Heidelberg, Germany

Universitaetsklinikum Duesseldorf-Gastroenterology, Hepatology and Infectiology ( Site 6802)

Düsseldorf, Germany

Universitaetsklinikum Carl Gustav Carus Dresden-Medical Dept I - Medical Oncology ( Site 6806)

Dresden, Germany

Facharztzentrum Eppendorf-Facharztzentrum Eppendorf ( Site 6807)

Hamburg, Germany

IRCCS - Istituto Romagnolo per lo Studio dei Tumori (IRST) "Dino Amadori"-Oncologia Medica ( Site 5207)

Meldola, Italy

Fondazione IRCCS Istituto Nazionale dei Tumori-Struttura Complessa Oncologia Medica 1 ( Site 5200)

Milan, Italy

Azienda Ospedaliero Universitaria Pisana ( Site 5206)

Pisa, Italy

Ospedale San Raffaele-Oncologia Medica ( Site 5202)

Milan, Italy

Oslo universitetssykehus, Radiumhospitalet ( Site 6501)

Oslo, Norway

Asan Medical Center-Department of Oncology ( Site 5901)

Seoul, South Korea

Samsung Medical Center-Division of Hematology/Oncology ( Site 5900)

Seoul, South Korea

Hôpitaux Universitaires de Genève (HUG) ( Site 6701)

Geneva, Switzerland

Kantonsspital Graubünden-Medizin ( Site 6700)

Chur, Switzerland

China Medical University Hospital ( Site 6007)

Taichung, Taiwan

National Cheng Kung University Hospital ( Site 6001)

Tainan, Taiwan

National Taiwan University Hospital-Oncology ( Site 6000)

Taipei, Taiwan

Taipei Veterans General Hospital ( Site 6005)

Taipei, Taiwan

Faculty of Medicine Siriraj Hospital ( Site 6102)

Bangkoknoi, Thailand

Chulalongkorn Hospital ( Site 6104)

Pathumwan, Thailand

Ramathibodi Hospital ( Site 6103)

Ratchathewi, Thailand

Songklanagarind hospital ( Site 6101)

Hat Yai, Thailand

Trial contact

Contact information from ClinicalTrials.gov. Contact in English.

Share this trial

Data from ClinicalTrials.gov. AI-assisted translation, last sync: 8/8/2026.

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