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NCT01602380 · OUTCOME

Objective Response Rate (ORR) for Fulvestrant Treatment Versus Anastrozole Treatment

A Global Study to Compare the Effects of Fulvestrant and Arimidex in a Subset of Patients With Breast Cancer. · Source last updated 2026-02-27

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
Not reported
Time frame
Baseline RECIST 1.1 assessments (Day 0) and then every 12 weeks until disease progression or treatment discontinuation (up to approximately 38 months)

What was measured

ORR was defined as the percentage patients with an objective response (i.e. those recording a partial response \[PR\] or complete response \[CR\]) at some point during the study, prior to disease progression. ORR was assessed in patients with measurable disease at baseline only. The determination of measurable disease at baseline was done using baseline RECIST data. CR was disappearance of all target lesions since baseline; was any pathological lymph nodes selected as target lesions (TL) to have a reduction in short axis to \<10 millimeter. PR was at least a 30% decrease in the sum of the diameters of TL, taking as reference the baseline sum of diameters.

Analysis population: Percentages for ORR were calculated based on the number of patients in the ITT analysis set (which included all randomised patients) who had measurable disease at baseline (n=193 for Fulvestrant arm and n=196 for Anastrozole arm).

Groups in this outcome

Fulvestrant 500 mg

Patients received fulvestrant (Faslodex™) 500 mg, administered as two 5 mL intramuscular injections, 1 in each buttock, at each visit on Days 0, 14 (±3), 28 (±3) and every 28 (±3) days thereafter. In order to support the double-blind, double-dummy design of the trial, each patient randomised to receive fulvestrant, also received placebo to match the anastrozole schedule (tablets, once daily).

Anastrozole 1 mg

Patients received anastrozole (Arimidex™), administered orally as a single tablet at a dose of 1 mg/day from randomisation on Day 0 and once daily thereafter. In order to support the double-blind, double-dummy design of the trial, each patient randomised to receive anastrozole also received placebo to match the fulvestrant schedule (injections on Days 0, 14 \[±3\], 28 \[±3\] and every 28 \[±3\] days thereafter).

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

Analysis denominator · Participants

GroupSource count
Fulvestrant 500 mg193
Anastrozole 1 mg196

Reported measurements

Source class 1
Values in Percentage of participants · Interval/dispersion: Not reported
GroupValueSpreadLowerUpperComment
Fulvestrant 500 mg46.1Not reportedNot reportedNot reportedNot reported
Anastrozole 1 mg44.9Not reportedNot reportedNot reportedNot reported

Source statistical analyses

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

  1. ci Lower Limit
    0.716
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    1.614
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY_OR_OTHER_LEGACY
    p Value
    0.7290
    p Value Comment
    2-sided p-value
    param Type
    Odds Ratio (OR)
    param Value
    1.074
    statistical Method
    Regression, Logistic
Complete source fields
analyses
  1. ci Lower Limit
    0.716
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    1.614
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY_OR_OTHER_LEGACY
    p Value
    0.7290
    p Value Comment
    2-sided p-value
    param Type
    Odds Ratio (OR)
    param Value
    1.074
    statistical Method
    Regression, Logistic
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        value
        46.1
      2. group Id
        OG001
        value
        44.9
denoms
  1. counts
    1. group Id
      OG000
      value
      193
    2. group Id
      OG001
      value
      196
    units
    Participants
description
ORR was defined as the percentage patients with an objective response (i.e. those recording a partial response \[PR\] or complete response \[CR\]) at some point during the study, prior to disease progression. ORR was assessed in patients with measurable disease at baseline only. The determination of measurable disease at baseline was done using baseline RECIST data. CR was disappearance of all target lesions since baseline; was any pathological lymph nodes selected as target lesions (TL) to have a reduction in short axis to \<10 millimeter. PR was at least a 30% decrease in the sum of the diameters of TL, taking as reference the baseline sum of diameters.
groups
  1. description
    Patients received fulvestrant (Faslodex™) 500 mg, administered as two 5 mL intramuscular injections, 1 in each buttock, at each visit on Days 0, 14 (±3), 28 (±3) and every 28 (±3) days thereafter. In order to support the double-blind, double-dummy design of the trial, each patient randomised to receive fulvestrant, also received placebo to match the anastrozole schedule (tablets, once daily).
    id
    OG000
    title
    Fulvestrant 500 mg
  2. description
    Patients received anastrozole (Arimidex™), administered orally as a single tablet at a dose of 1 mg/day from randomisation on Day 0 and once daily thereafter. In order to support the double-blind, double-dummy design of the trial, each patient randomised to receive anastrozole also received placebo to match the fulvestrant schedule (injections on Days 0, 14 \[±3\], 28 \[±3\] and every 28 \[±3\] days thereafter).
    id
    OG001
    title
    Anastrozole 1 mg
param Type
NUMBER
population Description
Percentages for ORR were calculated based on the number of patients in the ITT analysis set (which included all randomised patients) who had measurable disease at baseline (n=193 for Fulvestrant arm and n=196 for Anastrozole arm).
reporting Status
POSTED
time Frame
Baseline RECIST 1.1 assessments (Day 0) and then every 12 weeks until disease progression or treatment discontinuation (up to approximately 38 months)
title
Objective Response Rate (ORR) for Fulvestrant Treatment Versus Anastrozole Treatment
type
SECONDARY
unit Of Measure
Percentage of participants

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