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NCT04003636 · OUTCOME

Number of Participants Who Discontinued Study Intervention Due to an AE

Pembrolizumab (MK-3475) Plus Gemcitabine/Cisplatin Versus Placebo Plus Gemcitabine/Cisplatin for First-Line Advanced and/or Unresectable Biliary Tract Carcinoma (BTC) (MK-3475-966/KEYNOTE-966) · Source last updated 2026-03-24

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 approximately 63 months

What was measured

An AE was defined as any unfavorable and unintended sign including an abnormal laboratory finding, symptom or disease associated with the use of a medical treatment or procedure, regardless of whether it was considered related to the medical treatment or procedure, that occurs during the course of the study. Number of participants who discontinued study intervention due to an AE were reported.

Analysis population: All Participants as Treated (APaT) population, which consisted of all randomized participants who received at least 1 dose of study intervention.

Groups in this outcome

Arm A: Pembrolizumab + Chemotherapy

Participants received pembrolizumab, 200 mg intravenous (IV) infusion, every 3 weeks (Q3W), Day 1 of each 3-week cycle for up to 35 cycles PLUS Gemcitabine, 1000 mg/m\^2, IV infusion Q3W, Day 1 and Day 8 of each 3-week cycle until progressive disease or unacceptable toxicity PLUS Cisplatin, 25 mg/m\^2 IV infusion, Q3W, Day 1 and Day 8 of each 3-week cycle for up to 8 cycles. Eligible participants who stopped the initial course of pembrolizumab with Stable Disease (SD) or better but progressed after discontinuation initiated a second course of pembrolizumab 200mg IV Q3W, Day 1 of each 3-week cycle for up to 17 cycles. Treatment with Gemcitabine could have been stopped at any time in first or second course due to toxicity or disease progression.

Arm B: Placebo + Chemotherapy

Participants received Placebo to Pembrolizumab, 200 mg IV infusion, every 3 weeks (Q3W), Day 1 of each 3-week cycle for up to 35 cycles PLUS Gemcitabine, 1000 mg/m\^2 IV infusion, Q3W, Day 1 and Day 8 of each 3-week cycle until progressive disease or unacceptable toxicity PLUS Cisplatin, 25 mg/m\^2 IV infusion, Q3W, Day 1 and Day 8 of each 3-week cycle for up to 8 cycles.

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

Analysis denominator · Participants

GroupSource count
Arm A: Pembrolizumab + Chemotherapy529
Arm B: Placebo + Chemotherapy534

Reported measurements

Source class 1
Values in Participants · Interval/dispersion: Not reported
GroupValueSpreadLowerUpperComment
Arm A: Pembrolizumab + Chemotherapy140Not reportedNot reportedNot reportedNot reported
Arm B: Placebo + Chemotherapy125Not reportedNot reportedNot reportedNot reported
Complete source fields
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        value
        140
      2. group Id
        OG001
        value
        125
denoms
  1. counts
    1. group Id
      OG000
      value
      529
    2. group Id
      OG001
      value
      534
    units
    Participants
description
An AE was defined as any unfavorable and unintended sign including an abnormal laboratory finding, symptom or disease associated with the use of a medical treatment or procedure, regardless of whether it was considered related to the medical treatment or procedure, that occurs during the course of the study. Number of participants who discontinued study intervention due to an AE were reported.
groups
  1. description
    Participants received pembrolizumab, 200 mg intravenous (IV) infusion, every 3 weeks (Q3W), Day 1 of each 3-week cycle for up to 35 cycles PLUS Gemcitabine, 1000 mg/m\^2, IV infusion Q3W, Day 1 and Day 8 of each 3-week cycle until progressive disease or unacceptable toxicity PLUS Cisplatin, 25 mg/m\^2 IV infusion, Q3W, Day 1 and Day 8 of each 3-week cycle for up to 8 cycles. Eligible participants who stopped the initial course of pembrolizumab with Stable Disease (SD) or better but progressed after discontinuation initiated a second course of pembrolizumab 200mg IV Q3W, Day 1 of each 3-week cycle for up to 17 cycles. Treatment with Gemcitabine could have been stopped at any time in first or second course due to toxicity or disease progression.
    id
    OG000
    title
    Arm A: Pembrolizumab + Chemotherapy
  2. description
    Participants received Placebo to Pembrolizumab, 200 mg IV infusion, every 3 weeks (Q3W), Day 1 of each 3-week cycle for up to 35 cycles PLUS Gemcitabine, 1000 mg/m\^2 IV infusion, Q3W, Day 1 and Day 8 of each 3-week cycle until progressive disease or unacceptable toxicity PLUS Cisplatin, 25 mg/m\^2 IV infusion, Q3W, Day 1 and Day 8 of each 3-week cycle for up to 8 cycles.
    id
    OG001
    title
    Arm B: Placebo + Chemotherapy
param Type
COUNT_OF_PARTICIPANTS
population Description
All Participants as Treated (APaT) population, which consisted of all randomized participants who received at least 1 dose of study intervention.
reporting Status
POSTED
time Frame
Up to approximately 63 months
title
Number of Participants Who Discontinued Study Intervention Due to an AE
type
SECONDARY
unit Of Measure
Participants

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Preserved source evidence · Not medical advice