A Clinical Study of MK-2870 Alone or With Other Treatments to Treat Gastrointestinal Cancers (MK-9999-02A)

UCLA ( Site 0317), Los Angeles, California, United States

University of Colorado Anschutz Medical Campus ( Site 0299), Aurora, Colorado, United States

University of Colorado Anschutz Medical Campus ( Site 0325), Aurora, Colorado, United States

University of Colorado Anschutz Medical Campus ( Site 0326), Aurora, Colorado, United States

Sibley Memorial Hospital ( Site 0310), Washington D.C., District of Columbia, United States

University of Florida College of Medicine ( Site 0281), Gainesville, Florida, United States

Mount Sinai Cancer Center ( Site 0287), Miami Beach, Florida, United States

Northwest Georgia Oncology Centers, a Service of Wellstar Cobb Hospital ( Site 0303), Marietta, Georgia, United States

Perlmutter Cancer Center at NYU Langone Hospital - Long Island ( Site 0327), Mineola, New York, United States

Laura and Isaac Perlmutter Cancer Center at NYU Langone ( Site 0324), New York, New York, United States

University of Texas MD Anderson Cancer Center ( Site 0316), Houston, Texas, United States

Oncology and Hematology Associates of Southwest Virginia (BRCC) ( Site 0295), Roanoke, Virginia, United States

University Hospital and UW Health Clinics-Carbone Cancer Center ( Site 0293), Madison, Wisconsin, United States

Westmead Hospital ( Site 0003), Westmead, New South Wales, Australia

Royal Brisbane and Women's Hospital-Medical Oncology Clinical Trials Unit, Cancer Care Services ( Site 0001), Brisbane, Queensland, Australia

Epworth Freemasons ( Site 0005), East Melbourne, Victoria, Australia

Frankston Hospital-Oncology and Haematology ( Site 0004), Frankston, Victoria, Australia

One Clinical Research ( Site 0002), Nedlands, Western Australia, Australia

The Ottawa Hospital Cancer Centre ( Site 0027), Ottawa, Ontario, Canada

Centre Hospitalier de l'Université de Montréal-Unit for Innovative Therapies ( Site 0022), Montreal, Quebec, Canada

McGill University Health Centre ( Site 0023), Montreal, Quebec, Canada

James Lind Centro de Investigacion del Cancer ( Site 0048), Temuco, Araucania, Chile

FALP-UIDO ( Site 0041), Providencia, Region M. de Santiago, Chile

Clínica UC San Carlos de Apoquindo ( Site 0043), Santiago, Region M. de Santiago, Chile

Bradfordhill-Clinical Area ( Site 0047), Santiago, Region M. de Santiago, Chile

Beijing Cancer hospital-Digestive Oncology ( Site 0061), Beijing, Beijing Municipality, China

The 900th Hospital of the Joint Logistics Support Force of the Chinese People's Liberation Army ( Site 0063), Fuzhou, Fujian, China

Wuhan Union Hospital Cancer Center. ( Site 0064), Wuhan, Hubei, China

Hunan Cancer Hospital-intervention department ( Site 0066), Changsha, Hunan, China

Renji Hospital Shanghai Jiao Tong University School of Medicine-Oncology Department ( Site 0067), Shanghai, Shanghai Municipality, China

West China Hospital, Sichuan University ( Site 0068), Chengdu, Sichuan, China

Fondazione IRCCS Istituto Nazionale dei Tumori-Struttura Complessa Oncologia Medica 1 ( Site 0101), Milan, Lombardy, Italy

ASST Grande Ospedale Metropolitano Niguarda ( Site 0102), Milan, Lombardy, Italy

Fondazione Policlinico Universitario Agostino Gemelli IRCCS -Medical Oncology ( Site 0103), Roma, Italy

National Cancer Center Hospital East ( Site 0121), Kashiwa, Chiba, Japan

Kanagawa Cancer Center ( Site 0122), Yokohama, Kanagawa, Japan

Seoul National University Hospital ( Site 0161), Seoul, South Korea

Severance Hospital, Yonsei University Health System ( Site 0164), Seoul, South Korea

Asan Medical Center ( Site 0163), Seoul, South Korea

Samsung Medical Center ( Site 0162), Seoul, South Korea

HOSPITAL GENERAL UNIVERSITARIO GREGORIO MARAÑON-ONCOLOGY ( Site 0183), Madrid, Madrid, Comunidad de, Spain

Hospital Universitario Central de Asturias-Medical Oncology ( Site 0182), Oviedo, Principality of Asturias, Spain

Hospital Universitari Vall d'Hebron-Departamento de Oncologia- VHIO ( Site 0181), Barcelona, Spain

Hôpitaux Universitaires de Genève (HUG) ( Site 0202), Geneva, Canton of Geneva, Switzerland

Ospedale Regionale Bellinzona e Valli ( Site 0201), Bellinzona, Canton Ticino, Switzerland

China Medical University Hospital ( Site 0223), Taichung, Taiwan

National Cheng Kung University Hospital-Clinical Trial Center ( Site 0224), Tainan, Taiwan

National Taiwan University Hospital-Oncology ( Site 0225), Taipei, Taiwan

Taipei Veterans General Hospital ( Site 0221), Taipei, Taiwan

Chang Gung Medical Foundation-Linkou Branch ( Site 0222), Taoyuan, Taiwan

Hacettepe Universite Hastaneleri-oncology hospital ( Site 0241), Ankara, Turkey (Türkiye)

Ankara Bilkent Şehir Hastanesi-Medical Oncology ( Site 0242), Ankara, Turkey (Türkiye)

Barts Health NHS Trust ( Site 0263), London, England, United Kingdom

Royal Free Hospital ( Site 0262), London, England, United Kingdom

University Hospital Coventry & Warwickshire ( Site 0266), Coventry, United Kingdom