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NCT03615326 · OUTCOME

Duration of Response (DOR) Per RECIST 1.1 Assessed by BICR

Pembrolizumab/Placebo Plus Trastuzumab Plus Chemotherapy in Human Epidermal Growth Factor Receptor 2 Positive (HER2+) Advanced Gastric or Gastroesophageal Junction (GEJ) Adenocarcinoma (MK-3475-811/KEYNOTE-811) · Source last updated 2026-08-26

Results reported by the registry submitting party. Population, time horizon, units and missing values must be read together.

Measure
MEDIAN
Unit
Months
Interval / dispersion
95% Confidence Interval
Time frame
Up to 63 months

What was measured

For participants who demonstrate CR or PR, DOR is defined as the time from first response (CR or PR) to subsequent disease progression or death from any cause, whichever occurs first. DOR was determined for first course pembrolizumab in the Global Cohort. Per statistical analysis plan, participants in the Japan-specific SOX Cohort were not included in the efficacy analysis.

Analysis population: All randomized Global Cohort participants in the Pembrolizumab First Course arm and SOC arm and who had CR or PR per RECIST 1.1 as assessed by BICR were included in this analysis. Per statistical analysis plan, participants in the Japan-specific SOX Cohort were not included in the efficacy analysis.

Groups in this outcome

Global Pembrolizumab + Standard of Care First Course

Participants received 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 Standard of Care First Course

Participants received 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.

Group identifiers and denominators belong to this outcome only. They may differ in another outcome or in safety reporting.

Analysis denominator · Participants

GroupSource count
Global Pembrolizumab + Standard of Care First Course254
Global Standard of Care First Course209

Reported measurements

Source class 1
Values in Months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Global Pembrolizumab + Standard of Care First Course11.13Not reported9.812.7Not reported
Global Standard of Care First Course9.5Not reported7.211.2Not reported
Complete source fields
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        9.8
        upper Limit
        12.7
        value
        11.13
      2. group Id
        OG001
        lower Limit
        7.2
        upper Limit
        11.2
        value
        9.5
denoms
  1. counts
    1. group Id
      OG000
      value
      254
    2. group Id
      OG001
      value
      209
    units
    Participants
description
For participants who demonstrate CR or PR, DOR is defined as the time from first response (CR or PR) to subsequent disease progression or death from any cause, whichever occurs first. DOR was determined for first course pembrolizumab in the Global Cohort. Per statistical analysis plan, participants in the Japan-specific SOX Cohort were not included in the efficacy analysis.
dispersion Type
95% Confidence Interval
groups
  1. description
    Participants received 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.
    id
    OG000
    title
    Global Pembrolizumab + Standard of Care First Course
  2. description
    Participants received 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.
    id
    OG001
    title
    Global Standard of Care First Course
param Type
MEDIAN
population Description
All randomized Global Cohort participants in the Pembrolizumab First Course arm and SOC arm and who had CR or PR per RECIST 1.1 as assessed by BICR were included in this analysis. Per statistical analysis plan, participants in the Japan-specific SOX Cohort were not included in the efficacy analysis.
reporting Status
POSTED
time Frame
Up to 63 months
title
Duration of Response (DOR) Per RECIST 1.1 Assessed by BICR
type
SECONDARY
unit Of Measure
Months

Download exact source JSON → · Snapshot ctgov-results-191f4516d4760045304b24a0

Preserved source evidence · Not medical advice