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NCT03615326 · OUTCOME

Number of Participants Who Discontinued Study Treatment Due to AEs

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
COUNT_OF_PARTICIPANTS
Unit
Participants
Interval / dispersion
Not reported
Time frame
Up to 63 months

What was measured

An AE is any untoward medical occurrence in a participant that is temporally associated with the use of study treatment, whether or not considered related to the study treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study treatment. The number of participants who discontinued study treatment due to an AE is reported for each treatment arm. Per statistical analysis plan, data from the second course of pembrolizumab was not included in the safety analysis.

Analysis population: All randomized participants in the Global Cohort Pembrolizumab and SOC arms who received at least 1 dose of treatment, and all participants in the Japan-specific SOX Cohort who received at least 1 dose of treatment were included in this analysis. Per statistical analysis plan, data from the second course of pembrolizumab was not included in the safety 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.

Japan Pembrolizumab + Trastuzumab + S-1 Plus Oxaliplatin

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 SOX chemotherapy.

Japan Trastuzumab + S-1 Plus Oxaliplatin

Participants received matched placebo to pembrolizumab IV Q3W plus trastuzumab (8mg/kg loading dose, 6mg/kg maintenance thereafter) IV Q3W in combination with SOX 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 Course346
Japan Pembrolizumab + Trastuzumab + S-1 Plus Oxaliplatin20
Japan Trastuzumab + S-1 Plus Oxaliplatin20

Reported measurements

Source class 1
Values in Participants · Interval/dispersion: Not reported
GroupValueSpreadLowerUpperComment
Global Pembrolizumab + Standard of Care First Course150Not reportedNot reportedNot reportedNot reported
Global Standard of Care First Course136Not reportedNot reportedNot reportedNot reported
Japan Pembrolizumab + Trastuzumab + S-1 Plus Oxaliplatin11Not reportedNot reportedNot reportedNot reported
Japan Trastuzumab + S-1 Plus Oxaliplatin11Not reportedNot reportedNot reportedNot reported
Complete source fields
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        value
        150
      2. group Id
        OG001
        value
        136
      3. group Id
        OG002
        value
        11
      4. group Id
        OG003
        value
        11
denoms
  1. counts
    1. group Id
      OG000
      value
      350
    2. group Id
      OG001
      value
      346
    3. group Id
      OG002
      value
      20
    4. group Id
      OG003
      value
      20
    units
    Participants
description
An AE is any untoward medical occurrence in a participant that is temporally associated with the use of study treatment, whether or not considered related to the study treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study treatment. The number of participants who discontinued study treatment due to an AE is reported for each treatment arm. Per statistical analysis plan, data from the second course of pembrolizumab was not included in the safety analysis.
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
  3. 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 SOX chemotherapy.
    id
    OG002
    title
    Japan Pembrolizumab + Trastuzumab + S-1 Plus Oxaliplatin
  4. description
    Participants received matched placebo to pembrolizumab IV Q3W plus trastuzumab (8mg/kg loading dose, 6mg/kg maintenance thereafter) IV Q3W in combination with SOX chemotherapy.
    id
    OG003
    title
    Japan Trastuzumab + S-1 Plus Oxaliplatin
param Type
COUNT_OF_PARTICIPANTS
population Description
All randomized participants in the Global Cohort Pembrolizumab and SOC arms who received at least 1 dose of treatment, and all participants in the Japan-specific SOX Cohort who received at least 1 dose of treatment were included in this analysis. Per statistical analysis plan, data from the second course of pembrolizumab was not included in the safety analysis.
reporting Status
POSTED
time Frame
Up to 63 months
title
Number of Participants Who Discontinued Study Treatment Due to AEs
type
SECONDARY
unit Of Measure
Participants

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

Preserved source evidence · Not medical advice