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NCT03529110 · OUTCOME

Duration of Response (DoR) Based on BICR and Investigator Assessment in Participants With HER2-Positive, Unresectable and/or Metastatic Breast Cancer Previously Treated With Trastuzumab and Taxane

DS-8201a Versus T-DM1 for Human Epidermal Growth Factor Receptor 2 (HER2)-Positive, Unresectable and/or Metastatic Breast Cancer Previously Treated With Trastuzumab and Taxane [DESTINY-Breast03] · Source last updated 2025-10-21

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 33 months (data cut-off)

What was measured

Duration of Response (DoR) was defined as the time from the date of the first documentation of objective response (complete response \[CR\] or partial response \[PR\]) to the date of the first objective documentation of progressive disease (PD) or death due to any cause. DoR in participants with confirmed CR/PR based on BICR and investigator assessment is reported.

Analysis population: Duration of Response (DoR) was assessed in the Full Analysis Set of participants with confirmed CR/PR at data cut-off date of 21 May 2021.

Groups in this outcome

Trastuzumab Deruxtecan (T-DXd)

Participants with HER2-positive, unresectable and/or metastatic breast cancer participants previously treated with trastuzumab and taxane who received T-DXd as a sterile intravenous (IV) solution at a dose of 5.4 mg/kg every 3 weeks (Q3W).

Ado-trastuzumab Emtansine (T-DM1)

Participants with HER2-positive, unresectable and/or metastatic breast cancer participants previously treated with trastuzumab and taxane who received T-DM1 in accordance with the approved label.

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

Analysis denominator · Participants

GroupSource count
Trastuzumab Deruxtecan (T-DXd)261
Ado-trastuzumab Emtansine (T-DM1)263

Reported measurements

BICR

Analysis denominator · Participants

GroupSource count
Trastuzumab Deruxtecan (T-DXd)208
Ado-trastuzumab Emtansine (T-DM1)90
Values in months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Trastuzumab Deruxtecan (T-DXd)NANot reported20.3NAMedian and upper CI was not estimable due insufficient number of events.
Ado-trastuzumab Emtansine (T-DM1)NANot reported12.6NAMedian and upper CI was not estimable due insufficient number of events.
Investigator Assessment

Analysis denominator · Participants

GroupSource count
Trastuzumab Deruxtecan (T-DXd)201
Ado-trastuzumab Emtansine (T-DM1)97
Values in months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Trastuzumab Deruxtecan (T-DXd)NANot reported20.8NAMedian and upper CI was not estimable due insufficient number of events.
Ado-trastuzumab Emtansine (T-DM1)NANot reported14.1NAMedian and upper CI was not estimable due insufficient number of events.
Complete source fields
classes
  1. categories
    1. measurements
      1. comment
        Median and upper CI was not estimable due insufficient number of events.
        group Id
        OG000
        lower Limit
        20.3
        upper Limit
        NA
        value
        NA
      2. comment
        Median and upper CI was not estimable due insufficient number of events.
        group Id
        OG001
        lower Limit
        12.6
        upper Limit
        NA
        value
        NA
    denoms
    1. counts
      1. group Id
        OG000
        value
        208
      2. group Id
        OG001
        value
        90
      units
      Participants
    title
    BICR
  2. categories
    1. measurements
      1. comment
        Median and upper CI was not estimable due insufficient number of events.
        group Id
        OG000
        lower Limit
        20.8
        upper Limit
        NA
        value
        NA
      2. comment
        Median and upper CI was not estimable due insufficient number of events.
        group Id
        OG001
        lower Limit
        14.1
        upper Limit
        NA
        value
        NA
    denoms
    1. counts
      1. group Id
        OG000
        value
        201
      2. group Id
        OG001
        value
        97
      units
      Participants
    title
    Investigator Assessment
denoms
  1. counts
    1. group Id
      OG000
      value
      261
    2. group Id
      OG001
      value
      263
    units
    Participants
description
Duration of Response (DoR) was defined as the time from the date of the first documentation of objective response (complete response \[CR\] or partial response \[PR\]) to the date of the first objective documentation of progressive disease (PD) or death due to any cause. DoR in participants with confirmed CR/PR based on BICR and investigator assessment is reported.
dispersion Type
95% Confidence Interval
groups
  1. description
    Participants with HER2-positive, unresectable and/or metastatic breast cancer participants previously treated with trastuzumab and taxane who received T-DXd as a sterile intravenous (IV) solution at a dose of 5.4 mg/kg every 3 weeks (Q3W).
    id
    OG000
    title
    Trastuzumab Deruxtecan (T-DXd)
  2. description
    Participants with HER2-positive, unresectable and/or metastatic breast cancer participants previously treated with trastuzumab and taxane who received T-DM1 in accordance with the approved label.
    id
    OG001
    title
    Ado-trastuzumab Emtansine (T-DM1)
param Type
MEDIAN
population Description
Duration of Response (DoR) was assessed in the Full Analysis Set of participants with confirmed CR/PR at data cut-off date of 21 May 2021.
reporting Status
POSTED
time Frame
Up to 33 months (data cut-off)
title
Duration of Response (DoR) Based on BICR and Investigator Assessment in Participants With HER2-Positive, Unresectable and/or Metastatic Breast Cancer Previously Treated With Trastuzumab and Taxane
type
SECONDARY
unit Of Measure
months

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