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A Phase III, Randomized, Double-blind Trial Comparing Trastuzumab Plus Chemotherapy and Pembrolizumab With Trastuzumab Plus Chemotherapy and Placebo as First-line Treatment in Participants With HER2 Positive Advanced Gastric or Gastroesophageal Junction Adenocarcinoma - MK3475-811 (KEYNOTE 811)

Studio Clinico

Patologia: Neoplasie dello stomaco, Tumori dell’esofago

Osservazionale-Sperimentale: Sperimentale

Monocentrico-Multicentrico: Multicentrico


Fase di studio: III

Richiesta mandatoria di tessuto: No

Linee di trattamento: Prima linea

Criteri di inclusione: 

- Histologically or cytologically confirmed diagnosis of previously untreated, locally advanced unresectable or metastatic HER2 positive gastric or GEJ adenocarcinoma
- HER2-positive defined as either immunohistochemistry (IHC) 3+ or IHC 2+ in combination with in-situ hybridization positive (ISH+) or fluorescent in-situ hybridization (FISH), as assessed by central review on primary or metastatic tumor
- Has measurable disease as defined by RECIST 1.1 as determined by the site investigator
- Male participants must agree to use approved contraception
- Female participants who are not pregnant or breastfeeding, and who are either not a woman of childbearing potential (WOCBP), or are a WOCBP who agrees to use approved contraception
- Has a performance status of 0 or 1 on the Eastern Cooperative Oncology Group (ECOG) Performance Scale within 3 days prior to the first dose of trial treatment
- Has a life expectancy of greater than 6 months
- Has adequate organ function

Criteri di esclusione: 

- Has had previous therapy for locally advanced unresectable or metastatic gastric/GEJ cancer
- Has had major surgery, open biopsy or significant traumatic injury within 28 days prior to randomization, or anticipation of the need for major surgery during the course of study treatment
- Has had radiotherapy within 14 days of randomization
- Has a known additional malignancy that is progressing or has required active treatment within the past 5 years
- Has known active central nervous system (CNS) metastases and/or carcinomatous meningitis
- Has an active autoimmune disease that has required systemic treatment in past 2 years
- Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy
- Has a history of (non-infectious) pneumonitis that required steroids or current pneumonitis
- Has a known history of active tuberculosis (TB; Mycobacterium tuberculosis)
- Has an active infection requiring systemic therapy
- Has poorly controlled diarrhea
- Accumulation of pleural, ascitic, or pericardial fluid requiring drainage or diuretic drugs within 2 weeks prior to enrollment. If the participant is receiving diuretic drugs for other reasons, it is acceptable
- Has a history or current evidence of any condition, therapy, or laboratory abnormality that might confound the results of the trial, interfere with the participant's participation for the full duration of the trial, or is not in the best interest of the participant to participate, in the opinion of the treating investigator
- Has peripheral neuropathy > Grade 1
- Has a known psychiatric or substance abuse disorder that would interfere with cooperation with the requirements of the trial
- A WOCBP who has a positive urine pregnancy test within 72 hours prior to randomization or treatment allocation
- Is pregnant or breastfeeding, or expecting to conceive or father children within the projected duration of the trial, starting with the screening visit through 7 months after the last dose of trial treatment
- Has active or clinically significant cardiac disease
- Has a known history of Human Immunodeficiency Virus (HIV) (HIV 1/2 antibodies)
- Has a known history of Hepatitis B (defined as Hepatitis B surface antigen [HBsAg] reactive) or known active Hepatitis C virus (defined as HCV RNA [qualitative] is detected) infection
- Has severe hypersensitivity (≥Grade 3) to pembrolizumab, trastuzumab, study chemotherapy agents and/or to any excipients, murine proteins, or platinum-containing products
- Has had an allogeneic tissue/solid organ transplant
- 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 co-inhibitory T-cell receptor (e.g., cytotoxic T-lymphocyte-associated protein 4 [CTLA-4], OX 40, Cluster of Differentiation 137 [CD137])

Schema di trattamento: 

Experimental: Pembrolizumab + Trastuzumab + Chemotherapy
Participants receive 200 mg pembrolizumab IV every 3 weeks (Q3W) plus trastuzumab (8 mg/kg loading dose, 6 mg/kg maintenance thereafter) IV Q3W in combination with FP or CAPOX chemotherapy (Global Cohort) or SOX chemotherapy (Japan cohort).

Active Comparator: Placebo +Trastuzumab + Chemotherapy
Participants receive matched placebo to pembrolizumab IV Q3W plus trastuzumab (8mg/kg loading dose, 6mg/kg maintenance thereafter) IV Q3W in combination with FP or CAPOX chemotherapy (Global Cohort) or SOX chemotherapy (Japan cohort).

Trattamento sperimentale: 

Pembrolizumab + Trastuzumab + Chemotherapy

Trattamento di controllo: 

Placebo + Trastuzumab + Chemotherapy

Obiettivi primari dello studio: 

- Progression Free Survival (PFS) per RECIST 1.1 assessed by BICR [ Time Frame: Up to 4 years ]
- Overall Survival (OS) [ Time Frame: Up to 5 years ]

Obiettivi secondari dello studio: 

- Objective Response Rate (ORR) per RECIST 1.1 assessed by BICR [ Time Frame: Up to 5 years ]
- Duration of Response (DOR) per RECIST 1.1 assessed by BICR [ Time Frame: Up to 5 years ]
- Adverse Events (AE) [ Time Frame: Up to 5 years ]
- Treatment Discontinuations Due to AEs [ Time Frame: Up to 5 years ]

Data di inizio dell'arruolamento: 05.10.2018

Data di fine dell'arruolamento: 16.07.2021

Centri partecipanti

Nord Italia

Cliniche Humanitas Gavazzeni
Via Gavazzeni 21 - 24125 Bergamo - BG
Site stage: start-up

Riferimento: Dr. Giordano Beretta
Telefono: 0354204761


Istituto Europeo di Oncologia
Via Ripamonti 435 - 20141 Milano - MI

Riferimento: Dr. Nicola Fazio
Telefono: 0257489258


A.O.U. Policlinico di Modena
Via del Pozzo 71 - 41100 Modena - MO
Site stage: start-up



Istituto Oncologico Veneto IRCCS
Via Gattamelata 64 - 35128 Padova - PD

Riferimento: Dr.ssa Sara Lonardi
Telefono: 0498215910


Centro Italia

Ospedale Civile di Pescara
Via Fonte Romana 8 - 65124 Pescara - PE


AOU Pisana - Santa Chiara
Via Roma 67 - 56126 Pisa - PI
U.O. Oncologia Medica 2


Sud Italia e isole

Università degli Studi Magna Græcia
Viale Europa - 88100 Germaneto - CZ
A.O.U. Mater Domini - Campus Universitario 'S. Venuta'. U.O.C. Oncologia Medica

Riferimento: Prof. Pierosandro Tagliaferri
Telefono: 09613694324


AOU degli studi della Campania Luigi Vanvitelli
Piazza Luigi Miraglia 2 - 80138 Napoli - NA
Divisione di Oncologia Medica

Informazioni Generali


Numero di iscrizione a registro: 2018-000224-34

Data di inserimento: 06.12.2018

Data di aggiornamento: 15.04.2021


Merck Sharp & Dohme Corp.



Principal Investigator ITALIA

Mater Domini - Campus Universitario 'S. Venuta', Località Germaneto (Catanzaro)

Riferimento: Prof. Pierfrancesco Tassone

Telefono: 09613697029


Localita: Germaneto (CZ)


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