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NCT03425643 · OUTCOME

Major Pathological Response (mPR) Rate

Efficacy and Safety of Pembrolizumab (MK-3475) With Platinum Doublet Chemotherapy as Neoadjuvant/Adjuvant Therapy for Participants With Resectable Stage II, IIIA, and Resectable IIIB (T3-4N2) Non-small Cell Lung Cancer (MK-3475-671/KEYNOTE-671) · Source last updated 2026-07-29

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 approximately 8 weeks following completion of neoadjuvant treatment (up to Study Week 20)

What was measured

mPR rate is defined as the percentage of participants having ≤10% viable tumor cells in the resected primary tumor and all resected lymph nodes following completion of neoadjuvant therapy. The mPR rates as assessed by blinded independent pathologist are presented.

Analysis population: The analysis population consisted of all randomized participants.

Groups in this outcome

NAC + Neoadjuvant/Adjuvant Pembrolizumab

Neoadjuvant: Prior to surgery, participants receive up to 4 cycles (cycle length: 3 weeks) of pembrolizumab \[200 mg, intravenous (IV); given on cycle day 1\] in combination with platinum doublet neoadjuvant chemotherapy (NAC), consisting of cisplatin \[75 mg/m\^2, IV; given on cycle day 1\] and either Gemcitabine \[1000 mg/m\^2, IV; given on cycle days 1 and 8\] or Pemetrexed \[500 mg/m\^2, IV; given on cycle day 1\]. Adjuvant: 4-12 weeks following surgery, participants receive 13 cycles (cycle length: 3 weeks) of pembrolizumab \[200 mg, IV; given on cycle day 1\].

NAC + Neoadjuvant/Adjuvant Placebo

Neoadjuvant: Prior to surgery, participants receive up to 4 cycles (cycle length: 3 weeks) of placebo \[normal saline, IV; given on cycle day 1\] in combination with platinum doublet NAC, consisting of cisplatin \[75 mg/m\^2, IV; given on cycle day 1\] and either Gemcitabine \[1000 mg/m\^2, IV; given on cycle days 1 and 8\] or Pemetrexed \[500 mg/m\^2, IV; given on cycle day 1\]. Adjuvant: 4-12 weeks following surgery, participants receive 13 cycles (cycle length: 3 weeks) of placebo \[normal saline, IV; given on cycle day 1\].

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

Analysis denominator · Participants

GroupSource count
NAC + Neoadjuvant/Adjuvant Pembrolizumab397
NAC + Neoadjuvant/Adjuvant Placebo400

Reported measurements

Source class 1
Values in Percentage of Participants · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
NAC + Neoadjuvant/Adjuvant Pembrolizumab30.2Not reported25.735.0Not reported
NAC + Neoadjuvant/Adjuvant Placebo11.0Not reported8.114.5Not reported

Source statistical analyses

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

  1. ci Lower Limit
    13.9
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    24.7
    group Ids
    1. OG000
    2. OG001
    non Inferiority Comment
    Based on Miettinen \& Nurminen method stratified by Stage (II versus III), TPS (\>=50% versus \<50%), Histology (Squamous versus Non-squamous) and Region (East-Asia versus non-East Asia).
    non Inferiority Type
    OTHER
    p Value
    <0.00001
    param Type
    Difference in Percentage
    param Value
    19.2
    statistical Method
    Stratified Miettinen and Nurminen
Complete source fields
analyses
  1. ci Lower Limit
    13.9
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    24.7
    group Ids
    1. OG000
    2. OG001
    non Inferiority Comment
    Based on Miettinen \& Nurminen method stratified by Stage (II versus III), TPS (\>=50% versus \<50%), Histology (Squamous versus Non-squamous) and Region (East-Asia versus non-East Asia).
    non Inferiority Type
    OTHER
    p Value
    <0.00001
    param Type
    Difference in Percentage
    param Value
    19.2
    statistical Method
    Stratified Miettinen and Nurminen
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        25.7
        upper Limit
        35.0
        value
        30.2
      2. group Id
        OG001
        lower Limit
        8.1
        upper Limit
        14.5
        value
        11.0
denoms
  1. counts
    1. group Id
      OG000
      value
      397
    2. group Id
      OG001
      value
      400
    units
    Participants
description
mPR rate is defined as the percentage of participants having ≤10% viable tumor cells in the resected primary tumor and all resected lymph nodes following completion of neoadjuvant therapy. The mPR rates as assessed by blinded independent pathologist are presented.
dispersion Type
95% Confidence Interval
groups
  1. description
    Neoadjuvant: Prior to surgery, participants receive up to 4 cycles (cycle length: 3 weeks) of pembrolizumab \[200 mg, intravenous (IV); given on cycle day 1\] in combination with platinum doublet neoadjuvant chemotherapy (NAC), consisting of cisplatin \[75 mg/m\^2, IV; given on cycle day 1\] and either Gemcitabine \[1000 mg/m\^2, IV; given on cycle days 1 and 8\] or Pemetrexed \[500 mg/m\^2, IV; given on cycle day 1\]. Adjuvant: 4-12 weeks following surgery, participants receive 13 cycles (cycle length: 3 weeks) of pembrolizumab \[200 mg, IV; given on cycle day 1\].
    id
    OG000
    title
    NAC + Neoadjuvant/Adjuvant Pembrolizumab
  2. description
    Neoadjuvant: Prior to surgery, participants receive up to 4 cycles (cycle length: 3 weeks) of placebo \[normal saline, IV; given on cycle day 1\] in combination with platinum doublet NAC, consisting of cisplatin \[75 mg/m\^2, IV; given on cycle day 1\] and either Gemcitabine \[1000 mg/m\^2, IV; given on cycle days 1 and 8\] or Pemetrexed \[500 mg/m\^2, IV; given on cycle day 1\]. Adjuvant: 4-12 weeks following surgery, participants receive 13 cycles (cycle length: 3 weeks) of placebo \[normal saline, IV; given on cycle day 1\].
    id
    OG001
    title
    NAC + Neoadjuvant/Adjuvant Placebo
param Type
NUMBER
population Description
The analysis population consisted of all randomized participants.
reporting Status
POSTED
time Frame
Up to approximately 8 weeks following completion of neoadjuvant treatment (up to Study Week 20)
title
Major Pathological Response (mPR) Rate
type
SECONDARY
unit Of Measure
Percentage of Participants

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Preserved source evidence · Not medical advice