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NCT04494425 · OUTCOME

Overall Survival (OS) in the Hormone Receptor-Positive, Human Epidermal Growth Factor Receptor 2-low Population

Study of Trastuzumab Deruxtecan (T-DXd) vs Investigator's Choice Chemotherapy in HER2-low, Hormone Receptor Positive, Metastatic Breast Cancer · Source last updated 2026-03-04

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
From date of randomization until death due to any cause, up to PCD of 18 March 2024 (maximum of approximately 43.85 months)

What was measured

OS was defined as the time from the date of randomization until death due to any cause regardless of whether the participant withdrew from randomized therapy or received another anticancer therapy. Median OS was calculated using Kaplan-Meier method and its CI using Brookmeyer-Crowley method.

Analysis population: The HER2-low population included the subset of participants in the ITT population with HER2 IHC 2+/ISH- and IHC 1+ as determined per the IRT data for HER2 IHC expression.

Groups in this outcome

T-DXd

Participants received T-DXd 5.4 mg/kg via IV infusion every 3 weeks until PD, unacceptable toxicity, withdrawal of consent, or another criterion for discontinuation was met.

Chemotherapy

Participants received Investigator's choice single-agent chemotherapy (capecitabine 1000 or 1250 mg/m\^2 orally twice daily for 2 weeks followed by a 1-week rest period in 3-week cycles, paclitaxel 80 mg/m\^2 via IV infusion qw in 3-week cycles or nab-paclitaxel 100 mg/m\^2 via IV infusion qw for 3 weeks followed by 1-week rest period in 4-week cycles) until PD, unacceptable toxicity, withdrawal of consent, or another criterion for discontinuation was met.

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

Analysis denominator · Participants

GroupSource count
T-DXd359
Chemotherapy354

Reported measurements

Source class 1
Values in months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
T-DXd28.9Not reported25.733.7Not reported
Chemotherapy27.1Not reported23.529.9Not reported
Complete source fields
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        25.7
        upper Limit
        33.7
        value
        28.9
      2. group Id
        OG001
        lower Limit
        23.5
        upper Limit
        29.9
        value
        27.1
denoms
  1. counts
    1. group Id
      OG000
      value
      359
    2. group Id
      OG001
      value
      354
    units
    Participants
description
OS was defined as the time from the date of randomization until death due to any cause regardless of whether the participant withdrew from randomized therapy or received another anticancer therapy. Median OS was calculated using Kaplan-Meier method and its CI using Brookmeyer-Crowley method.
dispersion Type
95% Confidence Interval
groups
  1. description
    Participants received T-DXd 5.4 mg/kg via IV infusion every 3 weeks until PD, unacceptable toxicity, withdrawal of consent, or another criterion for discontinuation was met.
    id
    OG000
    title
    T-DXd
  2. description
    Participants received Investigator's choice single-agent chemotherapy (capecitabine 1000 or 1250 mg/m\^2 orally twice daily for 2 weeks followed by a 1-week rest period in 3-week cycles, paclitaxel 80 mg/m\^2 via IV infusion qw in 3-week cycles or nab-paclitaxel 100 mg/m\^2 via IV infusion qw for 3 weeks followed by 1-week rest period in 4-week cycles) until PD, unacceptable toxicity, withdrawal of consent, or another criterion for discontinuation was met.
    id
    OG001
    title
    Chemotherapy
param Type
MEDIAN
population Description
The HER2-low population included the subset of participants in the ITT population with HER2 IHC 2+/ISH- and IHC 1+ as determined per the IRT data for HER2 IHC expression.
reporting Status
POSTED
time Frame
From date of randomization until death due to any cause, up to PCD of 18 March 2024 (maximum of approximately 43.85 months)
title
Overall Survival (OS) in the Hormone Receptor-Positive, Human Epidermal Growth Factor Receptor 2-low Population
type
SECONDARY
unit Of Measure
months

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

Preserved source evidence · Not medical advice