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NCT04975308 · OUTCOME

Investigator-assessed Duration of Response (DoR) (Between Arm C and Arm A)

A Study of Imlunestrant, Investigator's Choice of Endocrine Therapy, and Imlunestrant Plus Abemaciclib in Participants With ER+, HER2- Advanced Breast Cancer · Source last updated 2026-07-22

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 CR or PR to Date of Objective Disease Progression or Death Due to Any Cause (Up To 19 Months)

What was measured

DoR is defined as the time from the date measurement criteria for CR or PR (whichever is first recorded) are first met until the first date that disease is recurrent or objective progression is observed, per RECIST 1.1 criteria, or the date of death from any cause in the absence of objectively determined disease progression or recurrence. Participants known to be alive and without disease progression were censored at the date of their last adequate tumor assessment per RECIST 1.1 criteria, or date of randomization (whichever is later).

Analysis population: All participants who were randomly assigned to either arm C or arm A and had achieved CR or PR responses (including censored). Number of participants censored in "Arm C=30," "Arm A=11."

Groups in this outcome

Arm C: Imlunestrant + Abemaciclib

Participants received Imlunestrant 400 mg orally once daily on Days 1 to 28 of a 28-day cycle, plus Abemaciclib 150 mg orally twice daily on Days 1 to 28 of a 28-day cycle, until disease progression or a criterion for discontinuation was met.

Arm A: Imlunestrant

Participants received Imlunestrant 400 milligrams (mg) orally once daily on days 1 to 28 of a 28-day cycle, until disease progression or a criterion for discontinuation were 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
Arm C: Imlunestrant + Abemaciclib45
Arm A: Imlunestrant20

Reported measurements

Source class 1
Values in Months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Arm C: Imlunestrant + Abemaciclib11.07Not reported9.13NADue to the high number of censored participants, there were not enough events to estimate the upper limit of the 95% confidence interval.
Arm A: Imlunestrant10.02Not reported6.5715.01Not reported
Complete source fields
classes
  1. categories
    1. measurements
      1. comment
        Due to the high number of censored participants, there were not enough events to estimate the upper limit of the 95% confidence interval.
        group Id
        OG000
        lower Limit
        9.13
        upper Limit
        NA
        value
        11.07
      2. group Id
        OG001
        lower Limit
        6.57
        upper Limit
        15.01
        value
        10.02
denoms
  1. counts
    1. group Id
      OG000
      value
      45
    2. group Id
      OG001
      value
      20
    units
    Participants
description
DoR is defined as the time from the date measurement criteria for CR or PR (whichever is first recorded) are first met until the first date that disease is recurrent or objective progression is observed, per RECIST 1.1 criteria, or the date of death from any cause in the absence of objectively determined disease progression or recurrence. Participants known to be alive and without disease progression were censored at the date of their last adequate tumor assessment per RECIST 1.1 criteria, or date of randomization (whichever is later).
dispersion Type
95% Confidence Interval
groups
  1. description
    Participants received Imlunestrant 400 mg orally once daily on Days 1 to 28 of a 28-day cycle, plus Abemaciclib 150 mg orally twice daily on Days 1 to 28 of a 28-day cycle, until disease progression or a criterion for discontinuation was met.
    id
    OG000
    title
    Arm C: Imlunestrant + Abemaciclib
  2. description
    Participants received Imlunestrant 400 milligrams (mg) orally once daily on days 1 to 28 of a 28-day cycle, until disease progression or a criterion for discontinuation were met.
    id
    OG001
    title
    Arm A: Imlunestrant
param Type
MEDIAN
population Description
All participants who were randomly assigned to either arm C or arm A and had achieved CR or PR responses (including censored). Number of participants censored in "Arm C=30," "Arm A=11."
reporting Status
POSTED
time Frame
From Date of CR or PR to Date of Objective Disease Progression or Death Due to Any Cause (Up To 19 Months)
title
Investigator-assessed Duration of Response (DoR) (Between Arm C and Arm A)
type
SECONDARY
unit Of Measure
Months

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Preserved source evidence · Not medical advice