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NCT02130557 · OUTCOME

Kaplan-Meier Estimate of Probability of Retaining Major Molecular Response (MMR) at Month 48

A Multicenter Phase 3, Open-Label Study of Bosutinib Versus Imatinib in Adult Patients With Newly Diagnosed Chronic Phase Chronic Myelogenous Leukemia · Source last updated 2021-05-18

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
Month 48

What was measured

The Kaplan-Meier curve was generated based on the first date of MMR until the date of the confirmed loss of MMR or censoring, objectively documented, for responders only. Confirmed loss of MMR was BCR-ABL/ABL IS ratio \>0.1% in association with a \>=5-fold increase in BCR-ABL/ABL IS ratio from the lowest value achieved up to that time-point confirmed by a second assessment at least 28 days later. Treatment discontinuation due to suboptimal response/treatment failure, progressive disease (PD) or death due to PD within 28 days of last dose were considered confirmed loss of MMR. PD was defined as disease progression to accelerated phase (AP) or blast phase (BP) CML.

Analysis population: mITT population included all randomized participants with Ph+ CML harboring the b2a2 and/or b3a2 transcript and baseline BCR-ABL copies \>0 with study drug assignment designated according to initial randomization and who achieved MMR (responders). Here, "Overall number of Participants Analyzed (N)" signifies number of participants evaluable for this outcome measure.

Groups in this outcome

Bosutinib

Participants with Philadelphia chromosome-positive CML received bosutinib tablets at a dose of 400 mg, orally once daily in the core treatment phase of 12 months and continued the same treatment into the extension phase or followed up for safety for up to approximately 4 years, until the end of the study, treatment failure, unacceptable toxicity, death, or withdrawal of consent, whichever occurred first.

Imatinib

Participants with Philadelphia chromosome-positive CML received imatinib tablets at a dose of 400 mg, orally once daily in the core treatment phase of 12 months and continued the same treatment into the extension phase or followed up for safety for up to approximately 4 years, until the end of the study, treatment failure, unacceptable toxicity, death, or withdrawal of consent, whichever occurred first.

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

Analysis denominator · Participants

GroupSource count
Bosutinib182
Imatinib158

Reported measurements

Source class 1
Values in percentage of participants · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Bosutinib92.2Not reported86.895.4Not reported
Imatinib92.0Not reported85.995.5Not reported

Source statistical analyses

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

  1. ci Lower Limit
    0.49
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    2.44
    estimate Comment
    Hazard ratio (95% CIs) are based on the treatment effect (Bosutinib compared with Imatinib) in a stratified (by Sokal risk group at randomization and region) Cox proportional hazards model for the hazard of the respective event.
    group Description
    The medians have not been reached in either arm, as such, the premature estimated hazard ratio is provided.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    param Type
    Hazard Ratio (HR)
    param Value
    1.09
Complete source fields
analyses
  1. ci Lower Limit
    0.49
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    2.44
    estimate Comment
    Hazard ratio (95% CIs) are based on the treatment effect (Bosutinib compared with Imatinib) in a stratified (by Sokal risk group at randomization and region) Cox proportional hazards model for the hazard of the respective event.
    group Description
    The medians have not been reached in either arm, as such, the premature estimated hazard ratio is provided.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    param Type
    Hazard Ratio (HR)
    param Value
    1.09
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        86.8
        upper Limit
        95.4
        value
        92.2
      2. group Id
        OG001
        lower Limit
        85.9
        upper Limit
        95.5
        value
        92.0
denoms
  1. counts
    1. group Id
      OG000
      value
      182
    2. group Id
      OG001
      value
      158
    units
    Participants
description
The Kaplan-Meier curve was generated based on the first date of MMR until the date of the confirmed loss of MMR or censoring, objectively documented, for responders only. Confirmed loss of MMR was BCR-ABL/ABL IS ratio \>0.1% in association with a \>=5-fold increase in BCR-ABL/ABL IS ratio from the lowest value achieved up to that time-point confirmed by a second assessment at least 28 days later. Treatment discontinuation due to suboptimal response/treatment failure, progressive disease (PD) or death due to PD within 28 days of last dose were considered confirmed loss of MMR. PD was defined as disease progression to accelerated phase (AP) or blast phase (BP) CML.
dispersion Type
95% Confidence Interval
groups
  1. description
    Participants with Philadelphia chromosome-positive CML received bosutinib tablets at a dose of 400 mg, orally once daily in the core treatment phase of 12 months and continued the same treatment into the extension phase or followed up for safety for up to approximately 4 years, until the end of the study, treatment failure, unacceptable toxicity, death, or withdrawal of consent, whichever occurred first.
    id
    OG000
    title
    Bosutinib
  2. description
    Participants with Philadelphia chromosome-positive CML received imatinib tablets at a dose of 400 mg, orally once daily in the core treatment phase of 12 months and continued the same treatment into the extension phase or followed up for safety for up to approximately 4 years, until the end of the study, treatment failure, unacceptable toxicity, death, or withdrawal of consent, whichever occurred first.
    id
    OG001
    title
    Imatinib
param Type
NUMBER
population Description
mITT population included all randomized participants with Ph+ CML harboring the b2a2 and/or b3a2 transcript and baseline BCR-ABL copies \>0 with study drug assignment designated according to initial randomization and who achieved MMR (responders). Here, "Overall number of Participants Analyzed (N)" signifies number of participants evaluable for this outcome measure.
reporting Status
POSTED
time Frame
Month 48
title
Kaplan-Meier Estimate of Probability of Retaining Major Molecular Response (MMR) at Month 48
type
SECONDARY
unit Of Measure
percentage of participants

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Preserved source evidence · Not medical advice