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NCT04472429 · OUTCOME

Overall Survival

Carboplatin-paclitaxel With Retifanlimab or Placebo in Participants With Locally Advanced or Metastatic Squamous Cell Anal Carcinoma (POD1UM-303/InterAACT 2). · Source last updated 2026-09-02

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 56.5 months

What was measured

Overall survival was defined as the time from the date of randomization until the date of death due to any cause.

Analysis population: Full Analysis Set. Median survival time was estimated using Kaplan-Meier method. The confidence interval for median survival time was calculated using the method of Brookmeyer and Crowley.

Groups in this outcome

Retifanlimab 500 mg Q4W + Chemotherapy

Participants received retifanlimab 500 milligrams (mg) every 4 weeks (Q4W) for up to thirteen 28-day cycles (1 year) in the absence of disease progression, intolerable toxicity, death, withdrawal of consent, being lost to follow-up, or premature discontinuation of all assigned study drug administration or for any other reason. Participants also received the standard-of-care chemotherapy regimen of up to 6 induction cycles (24 weeks) of carboplatin (AUC5 on Day 1) and paclitaxel (80 mg per meters squared \[mg/m\^2\] on Days 1, 8, and 15).

Placebo + Chemotherapy

Participants received matching placebo Q4W for up to thirteen 28-day cycles (1 year) in the absence of disease progression, intolerable toxicity, death, withdrawal of consent, being lost to follow-up, or premature discontinuation of all assigned study drug administration or for any other reason.

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

Analysis denominator · Participants

GroupSource count
Retifanlimab 500 mg Q4W + Chemotherapy154
Placebo + Chemotherapy154

Reported measurements

Source class 1
Values in months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Retifanlimab 500 mg Q4W + Chemotherapy32.8Not reported25.744.5Not reported
Placebo + Chemotherapy22.2Not reported15.727.2Not reported

Source statistical analyses

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

  1. ci Lower Limit
    0.55
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    1.01
    estimate Comment
    A stratified Cox regression with Efron's method for tie handling was used to estimate the hazard ratio.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    p Value
    0.0305
    p Value Comment
    based on stratified log-rank test at an overall 1-sided 2.5% level of significance, using O'Brien and Fleming boundary to adjust for alpha spending at interim analysis
    param Type
    Hazard Ratio (HR)
    param Value
    0.75
    statistical Method
    stratified log-rank test
Complete source fields
analyses
  1. ci Lower Limit
    0.55
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    1.01
    estimate Comment
    A stratified Cox regression with Efron's method for tie handling was used to estimate the hazard ratio.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    p Value
    0.0305
    p Value Comment
    based on stratified log-rank test at an overall 1-sided 2.5% level of significance, using O'Brien and Fleming boundary to adjust for alpha spending at interim analysis
    param Type
    Hazard Ratio (HR)
    param Value
    0.75
    statistical Method
    stratified log-rank test
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        25.7
        upper Limit
        44.5
        value
        32.8
      2. group Id
        OG001
        lower Limit
        15.7
        upper Limit
        27.2
        value
        22.2
denoms
  1. counts
    1. group Id
      OG000
      value
      154
    2. group Id
      OG001
      value
      154
    units
    Participants
description
Overall survival was defined as the time from the date of randomization until the date of death due to any cause.
dispersion Type
95% Confidence Interval
groups
  1. description
    Participants received retifanlimab 500 milligrams (mg) every 4 weeks (Q4W) for up to thirteen 28-day cycles (1 year) in the absence of disease progression, intolerable toxicity, death, withdrawal of consent, being lost to follow-up, or premature discontinuation of all assigned study drug administration or for any other reason. Participants also received the standard-of-care chemotherapy regimen of up to 6 induction cycles (24 weeks) of carboplatin (AUC5 on Day 1) and paclitaxel (80 mg per meters squared \[mg/m\^2\] on Days 1, 8, and 15).
    id
    OG000
    title
    Retifanlimab 500 mg Q4W + Chemotherapy
  2. description
    Participants received matching placebo Q4W for up to thirteen 28-day cycles (1 year) in the absence of disease progression, intolerable toxicity, death, withdrawal of consent, being lost to follow-up, or premature discontinuation of all assigned study drug administration or for any other reason.
    id
    OG001
    title
    Placebo + Chemotherapy
param Type
MEDIAN
population Description
Full Analysis Set. Median survival time was estimated using Kaplan-Meier method. The confidence interval for median survival time was calculated using the method of Brookmeyer and Crowley.
reporting Status
POSTED
time Frame
up to 56.5 months
title
Overall Survival
type
SECONDARY
unit Of Measure
months

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Preserved source evidence · Not medical advice