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NCT01740427 · OUTCOME

Objective Response as Assessed by the Investigator

A Study of Palbociclib (PD-0332991) + Letrozole vs. Letrozole For 1st Line Treatment Of Postmenopausal Women With ER+/HER2- Advanced Breast Cancer (PALOMA-2) · Source last updated 2024-11-14

Results reported by the registry submitting party. Population, time horizon, units and missing values must be read together.

Measure
NUMBER
Unit
Percentage of participants
Interval / dispersion
95% Confidence Interval
Time frame
From randomization until end of treatment (up to approximately 2.5 years)

What was measured

Objective Response (OR) defined as overall complete response (CR) or partial response (PR) according to RECIST v1.1. Objective Response Rate (ORR) is defined as proportion of participants with CR or PR relative to all randomized participants with measurable disease at baseline. Participants who do not have on-study radiographic tumor re-evaluation, who received anti-tumor treatment, or who died, progressed/ dropped out for any reason prior to reaching a CR or PR were counted as non-responders in assessment of ORR. Per RECIST v1.1, CR: Complete disappearance of target lesions with exception of nodal disease. All target nodes must decrease to normal size (short axis \<10mm). PR: \>=30% decrease under baseline of the sum of diameters of all target measurable lesions. The short diameter is used in the sum for target nodes, while the longest diameter is used in the sum for all other target lesions. Stable Disease: neither sufficient shrinkage nor increase to qualify for disease progression.

Analysis population: ITT population or full analysis set included all participants who were randomized, with study medication, regardless of whether participants received study medication or received a different drug from that to which they were randomized.

Groups in this outcome

Palbociclib Plus Letrozole

Participants received letrozole 2.5 milligram (mg) orally QD (once daily) combined with palbociclib 125 mg QD for 21 days of every-28-day cycle, followed by 7 days off treatment.

Placebo Plus Letrozole

Participants received letrozole 2.5 mg orally QD combined with placebo QD for 21 days of every-28-day cycle, followed by 7 days off treatment.

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

Analysis denominator · Participants

GroupSource count
Palbociclib Plus Letrozole444
Placebo Plus Letrozole222

Reported measurements

Source class 1
Values in Percentage of participants · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Palbociclib Plus Letrozole46.4Not reported41.751.2Not reported
Placebo Plus Letrozole38.3Not reported31.945.0Not reported

Source statistical analyses

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

  1. ci Lower Limit
    1.008
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    2.030
    group Description
    Stratified analysis: Stratified by disease site (visceral vs non-visceral) per randomization.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY_OR_OTHER_LEGACY
    p Value
    0.0224
    p Value Comment
    1-sided p-value is from exact test.
    param Type
    Odds Ratio (OR)
    param Value
    1.428
    statistical Method
    Fisher Exact
Complete source fields
analyses
  1. ci Lower Limit
    1.008
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    2.030
    group Description
    Stratified analysis: Stratified by disease site (visceral vs non-visceral) per randomization.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY_OR_OTHER_LEGACY
    p Value
    0.0224
    p Value Comment
    1-sided p-value is from exact test.
    param Type
    Odds Ratio (OR)
    param Value
    1.428
    statistical Method
    Fisher Exact
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        41.7
        upper Limit
        51.2
        value
        46.4
      2. group Id
        OG001
        lower Limit
        31.9
        upper Limit
        45.0
        value
        38.3
denoms
  1. counts
    1. group Id
      OG000
      value
      444
    2. group Id
      OG001
      value
      222
    units
    Participants
description
Objective Response (OR) defined as overall complete response (CR) or partial response (PR) according to RECIST v1.1. Objective Response Rate (ORR) is defined as proportion of participants with CR or PR relative to all randomized participants with measurable disease at baseline. Participants who do not have on-study radiographic tumor re-evaluation, who received anti-tumor treatment, or who died, progressed/ dropped out for any reason prior to reaching a CR or PR were counted as non-responders in assessment of ORR. Per RECIST v1.1, CR: Complete disappearance of target lesions with exception of nodal disease. All target nodes must decrease to normal size (short axis \<10mm). PR: \>=30% decrease under baseline of the sum of diameters of all target measurable lesions. The short diameter is used in the sum for target nodes, while the longest diameter is used in the sum for all other target lesions. Stable Disease: neither sufficient shrinkage nor increase to qualify for disease progression.
dispersion Type
95% Confidence Interval
groups
  1. description
    Participants received letrozole 2.5 milligram (mg) orally QD (once daily) combined with palbociclib 125 mg QD for 21 days of every-28-day cycle, followed by 7 days off treatment.
    id
    OG000
    title
    Palbociclib Plus Letrozole
  2. description
    Participants received letrozole 2.5 mg orally QD combined with placebo QD for 21 days of every-28-day cycle, followed by 7 days off treatment.
    id
    OG001
    title
    Placebo Plus Letrozole
param Type
NUMBER
population Description
ITT population or full analysis set included all participants who were randomized, with study medication, regardless of whether participants received study medication or received a different drug from that to which they were randomized.
reporting Status
POSTED
time Frame
From randomization until end of treatment (up to approximately 2.5 years)
title
Objective Response as Assessed by the Investigator
type
SECONDARY
unit Of Measure
Percentage of participants

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