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NCT03615326 · OUTCOME

Objective Response Rate (ORR) 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
NUMBER
Unit
Percentage of Participants
Interval / dispersion
95% Confidence Interval
Time frame
Up to 63 months

What was measured

ORR is defined as the percentage of participants who have a Complete Response (\[CR\], disappearance of all evidence of disease) or Partial Response (\[PR\], regression of measurable disease and no new sites) per RECIST 1.1 as assessed by blinded independent central review (BICR). ORR 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 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 Course350
Global Standard of Care First Course348

Reported measurements

Source class 1
Values in Percentage of Participants · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Global Pembrolizumab + Standard of Care First Course72.6Not reported67.677.2Not reported
Global Standard of Care First Course60.1Not reported54.765.2Not reported

Source statistical analyses

Group order, estimate direction, methods and comments are retained. No treatment ranking is inferred.

  1. ci Lower Limit
    5.6
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    19.4
    group Description
    ORR in all participants of the Global Pembrolizumab + SOC First Course was compared to PFS in all participants of the Global Standard of Care to address the hypothesis (pembrolizumab in combination with trastuzumab plus chemotherapy is superior to trastuzumab plus chemotherapy alone).
    group Ids
    1. OG000
    2. OG001
    non Inferiority Comment
    The difference in percentage and its 95% confidence interval (CI) were estimated using the Miettinen \& Nurminen method stratified by geographic region, PD-L1 status (positive vs. negative) at baseline, and chemotherapy regimen (FP or CAPOX).
    non Inferiority Type
    SUPERIORITY
    p Value
    0.00020
    p Value Comment
    One-sided p-value for testing. H0: difference in % = 0 versus H1: difference in % \> 0.
    param Type
    Difference in Percentage
    param Value
    12.6
    statistical Method
    Stratified Miettinen and Nurminen Method
Complete source fields
analyses
  1. ci Lower Limit
    5.6
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    19.4
    group Description
    ORR in all participants of the Global Pembrolizumab + SOC First Course was compared to PFS in all participants of the Global Standard of Care to address the hypothesis (pembrolizumab in combination with trastuzumab plus chemotherapy is superior to trastuzumab plus chemotherapy alone).
    group Ids
    1. OG000
    2. OG001
    non Inferiority Comment
    The difference in percentage and its 95% confidence interval (CI) were estimated using the Miettinen \& Nurminen method stratified by geographic region, PD-L1 status (positive vs. negative) at baseline, and chemotherapy regimen (FP or CAPOX).
    non Inferiority Type
    SUPERIORITY
    p Value
    0.00020
    p Value Comment
    One-sided p-value for testing. H0: difference in % = 0 versus H1: difference in % \> 0.
    param Type
    Difference in Percentage
    param Value
    12.6
    statistical Method
    Stratified Miettinen and Nurminen Method
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        67.6
        upper Limit
        77.2
        value
        72.6
      2. group Id
        OG001
        lower Limit
        54.7
        upper Limit
        65.2
        value
        60.1
denoms
  1. counts
    1. group Id
      OG000
      value
      350
    2. group Id
      OG001
      value
      348
    units
    Participants
description
ORR is defined as the percentage of participants who have a Complete Response (\[CR\], disappearance of all evidence of disease) or Partial Response (\[PR\], regression of measurable disease and no new sites) per RECIST 1.1 as assessed by blinded independent central review (BICR). ORR 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
NUMBER
population Description
All randomized Global Cohort participants in the Pembrolizumab First Course arm and SOC arm 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
Objective Response Rate (ORR) Per RECIST 1.1 Assessed by BICR
type
SECONDARY
unit Of Measure
Percentage of Participants

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Preserved source evidence · Not medical advice