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NCT02003924 · OUTCOME

Time to First Use of Cytotoxic Chemotherapy

Safety and Efficacy Study of Enzalutamide in Patients With Nonmetastatic Castration-Resistant Prostate Cancer · Source last updated 2026-01-27

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 randomization up to the first use of cytotoxic chemotherapy (until the data cut-off date of 28 June 2017, maximum duration of treatment: 42.8 months)

What was measured

Time to first use of cytotoxic chemotherapy was defined as the time from randomization to the first use of cytotoxic chemotherapy for prostate cancer. Participants not starting treatment with a cytotoxic chemotherapy for prostate cancer at the time of analysis were right censored at the date of last assessment before the analysis data cutoff date for the purposes of analysis. Analysis was based on Kaplan-Meier estimates.

Analysis population: The ITT population was defined as all participants randomly assigned to study treatment and was based on randomized treatment assignment regardless of whether or not treatment was administered.

Groups in this outcome

Enzalutamide 160 mg

Participants received 4 capsules of Enzalutamide 40 mg each (total dose 160 mg per day) orally, once daily in double-blind and open-label phase (up to a maximum of 68.8 months) until radiographic progression. Participants after last dose of study drug, were followed up for safety up to 30 days, and were long term followed up (for survival status and new prostate cancer therapies) from last dose to the death date or last known survival date.

Placebo

Participants received 4 capsules of placebo (matched to Enzalutamide) orally, once daily in double blind phase (up to a maximum of 51.3 months) until radiographic progression. Participants were given an opportunity to switch to open-label enzalutamide after completion of double blind phase. Participants after last dose of study drug, were followed up for safety up to 30 days and were long term followed up (for survival status and new prostate cancer therapies) to the death date or last known survival date.

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

Analysis denominator · Participants

GroupSource count
Enzalutamide 160 mg933
Placebo468

Reported measurements

Source class 1
Values in months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Enzalutamide 160 mgNANot reported38.1NAThe median and upper limit of the 95% CI was not estimable due to the small number of events.
Placebo39.7Not reported38.941.3Not reported

Source statistical analyses

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

  1. ci Lower Limit
    0.282
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    0.507
    estimate Comment
    HR was based on a Cox regression model (with treatment as the only covariate) stratified by factors defined above, and was relative to placebo with \< 1 favoring Enzalutamide.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    p Value
    <0.0001
    p Value Comment
    P-value was based on a stratified log-rank test by PSA doubling time (\< 6 months, \>= 6 months) and prior or concurrent use of a bone targeting agent (yes, no) as per IXRS.
    param Type
    Hazard Ratio (HR)
    param Value
    0.378
    statistical Method
    Log Rank
Complete source fields
analyses
  1. ci Lower Limit
    0.282
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    0.507
    estimate Comment
    HR was based on a Cox regression model (with treatment as the only covariate) stratified by factors defined above, and was relative to placebo with \< 1 favoring Enzalutamide.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    p Value
    <0.0001
    p Value Comment
    P-value was based on a stratified log-rank test by PSA doubling time (\< 6 months, \>= 6 months) and prior or concurrent use of a bone targeting agent (yes, no) as per IXRS.
    param Type
    Hazard Ratio (HR)
    param Value
    0.378
    statistical Method
    Log Rank
classes
  1. categories
    1. measurements
      1. comment
        The median and upper limit of the 95% CI was not estimable due to the small number of events.
        group Id
        OG000
        lower Limit
        38.1
        upper Limit
        NA
        value
        NA
      2. group Id
        OG001
        lower Limit
        38.9
        upper Limit
        41.3
        value
        39.7
denoms
  1. counts
    1. group Id
      OG000
      value
      933
    2. group Id
      OG001
      value
      468
    units
    Participants
description
Time to first use of cytotoxic chemotherapy was defined as the time from randomization to the first use of cytotoxic chemotherapy for prostate cancer. Participants not starting treatment with a cytotoxic chemotherapy for prostate cancer at the time of analysis were right censored at the date of last assessment before the analysis data cutoff date for the purposes of analysis. Analysis was based on Kaplan-Meier estimates.
dispersion Type
95% Confidence Interval
groups
  1. description
    Participants received 4 capsules of Enzalutamide 40 mg each (total dose 160 mg per day) orally, once daily in double-blind and open-label phase (up to a maximum of 68.8 months) until radiographic progression. Participants after last dose of study drug, were followed up for safety up to 30 days, and were long term followed up (for survival status and new prostate cancer therapies) from last dose to the death date or last known survival date.
    id
    OG000
    title
    Enzalutamide 160 mg
  2. description
    Participants received 4 capsules of placebo (matched to Enzalutamide) orally, once daily in double blind phase (up to a maximum of 51.3 months) until radiographic progression. Participants were given an opportunity to switch to open-label enzalutamide after completion of double blind phase. Participants after last dose of study drug, were followed up for safety up to 30 days and were long term followed up (for survival status and new prostate cancer therapies) to the death date or last known survival date.
    id
    OG001
    title
    Placebo
param Type
MEDIAN
population Description
The ITT population was defined as all participants randomly assigned to study treatment and was based on randomized treatment assignment regardless of whether or not treatment was administered.
reporting Status
POSTED
time Frame
From randomization up to the first use of cytotoxic chemotherapy (until the data cut-off date of 28 June 2017, maximum duration of treatment: 42.8 months)
title
Time to First Use of Cytotoxic Chemotherapy
type
SECONDARY
unit Of Measure
months

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Preserved source evidence · Not medical advice