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NCT04494425 · OUTCOME

Duration of Response Assessed by Blinded Independent Central Review and Investigator in the Intent-to-Treat 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
Inter-Quartile Range
Time frame
Response evaluations performed at screening, q6w ± 1 week from randomization for 48 weeks, and then q9w ± 1 week, starting at Week 48 until PD, up to PCD of 18 March 2024 (maximum of approximately 43.85 months)

What was measured

DOR per RECIST v1.1 was defined as the time from the date of first documented response until date of documented progression or death in the absence of PD. PD was defined as at least a 20% increase in the sum of diameters of TLs, taking as reference the smallest previous sum of diameters (nadir), this included the baseline sum if that was the smallest on study. In addition to the relative increase of 20%, the sum must demonstrate an absolute increase of at least 5 mm from nadir. Median DOR was calculated using Kaplan-Meier method.

Analysis population: The ITT population included all randomized participants. Only participants with response in each specified category are reported.

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-DXd268
Chemotherapy167

Reported measurements

BICR Assessment

Analysis denominator · Participants

GroupSource count
T-DXd268
Chemotherapy158
Values in months · Interval/dispersion: Inter-Quartile Range
GroupValueSpreadLowerUpperComment
T-DXd13.7Not reported6.524.9Not reported
Chemotherapy7.3Not reported4.215.9Not reported
Investigator Assessment

Analysis denominator · Participants

GroupSource count
T-DXd268
Chemotherapy167
Values in months · Interval/dispersion: Inter-Quartile Range
GroupValueSpreadLowerUpperComment
T-DXd12.1Not reported6.820.0Not reported
Chemotherapy6.9Not reported3.012.5Not reported
Complete source fields
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        6.5
        upper Limit
        24.9
        value
        13.7
      2. group Id
        OG001
        lower Limit
        4.2
        upper Limit
        15.9
        value
        7.3
    denoms
    1. counts
      1. group Id
        OG000
        value
        268
      2. group Id
        OG001
        value
        158
      units
      Participants
    title
    BICR Assessment
  2. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        6.8
        upper Limit
        20.0
        value
        12.1
      2. group Id
        OG001
        lower Limit
        3.0
        upper Limit
        12.5
        value
        6.9
    denoms
    1. counts
      1. group Id
        OG000
        value
        268
      2. group Id
        OG001
        value
        167
      units
      Participants
    title
    Investigator Assessment
denoms
  1. counts
    1. group Id
      OG000
      value
      268
    2. group Id
      OG001
      value
      167
    units
    Participants
description
DOR per RECIST v1.1 was defined as the time from the date of first documented response until date of documented progression or death in the absence of PD. PD was defined as at least a 20% increase in the sum of diameters of TLs, taking as reference the smallest previous sum of diameters (nadir), this included the baseline sum if that was the smallest on study. In addition to the relative increase of 20%, the sum must demonstrate an absolute increase of at least 5 mm from nadir. Median DOR was calculated using Kaplan-Meier method.
dispersion Type
Inter-Quartile Range
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 ITT population included all randomized participants. Only participants with response in each specified category are reported.
reporting Status
POSTED
time Frame
Response evaluations performed at screening, q6w ± 1 week from randomization for 48 weeks, and then q9w ± 1 week, starting at Week 48 until PD, up to PCD of 18 March 2024 (maximum of approximately 43.85 months)
title
Duration of Response Assessed by Blinded Independent Central Review and Investigator in the Intent-to-Treat Population
type
SECONDARY
unit Of Measure
months

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Preserved source evidence · Not medical advice