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NCT02264574 · OUTCOME

Primary Analysis: Progression Free Survival (PFS) Based on Independent Review Committee (IRC) Assessment - Kaplan Meier Landmark Estimates at Month 30

A Multi-Center Study of Ibrutinib in Combination With Obinutuzumab Versus Chlorambucil in Combination With Obinutuzumab in Patients With Treatment naïve Chronic Lymphocytic Leukemia (CLL) or Small Lymphocytic Lymphoma (SLL) · Source last updated 2020-09-21

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 30 (Median follow-up time was 31.3 months at the time of the primary analysis [data cutoff date: 26 March 2018]).

What was measured

PFS was defined as time from the date randomization to the date of first IRC-confirmed disease progression (PD) or date of death due to any cause, whichever occurred first, regardless of the use of subsequent antineoplastic therapy prior to documented PD or death. Assessment of PD was conducted in accordance with the International Workshop on Chronic Lymphocytic Leukemia (IWCLL) 2008 criteria (Halleck et al) with the modification that treatment-related lymphocytosis in the absence of other signs or symptoms of disease progression was not considered progressive disease. The primary analysis was performed after observing 94 PFS events as pre-specified in the study protocol. As the median PFS was not reached in the experimental (IBR+OB) arm at the time of the analysis, Kaplan Meier landmark estimates of the PFS rate at 30 months (that is, the estimated percentage of participants with progression-free survival at Month 30) are presented.

Analysis population: Intent to Treat population: all randomized participants

Groups in this outcome

IBR+OB

Ibrutinib (IBR) given orally at a dose of 420 mg/day until progressive disease or unacceptable toxicity. Intravenous obinutuzumab (OB) given on Days 1 and 2 (100 mg on Day 1 and 900 mg on Day 2), 1000 mg on Days 8 and 15 of Cycle 1 and 1000 mg on Day 1 of each cycle up to 6 cycles or until progressive disease or unacceptable toxicity.

CLB+OB

Chlorambucil (CLB) given orally at a dose of 0.5 mg/kg body weight up to a total of 6 cycles on Days 1 and 15 of each cycle or until disease progression or unacceptable toxicity. Intravenous obinutuzumab (OB) given on Days 1 and 2 (100 mg on Day 1 and 900 mg on Day 2), 1000 mg on Days 8 and 15 of Cycle 1 and 1000 mg on Day 1 of each cycle up to 6 cycles or until disease progression or unacceptable toxicity.

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

Analysis denominator · Participants

GroupSource count
IBR+OB113
CLB+OB116

Reported measurements

Source class 1
Values in percentage of participants · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
IBR+OB78.5Not reported69.585.2Not reported
CLB+OB31.1Not reported22.540.0Not reported

Source statistical analyses

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

  1. ci Lower Limit
    0.145
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    0.367
    estimate Comment
    The hazard ratio and its 95% confidence interval were estimated using a Cox regression model with treatment as the only covariate.
    group Description
    To preserve the study wise type I error rate of 0.05, the primary and secondary endpoints were tested based on serial gatekeeping testing procedure at the two-sided significance level of 0.05 according to the hierarchical order of the primary analysis outcome measures presented in this record.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    p Value
    <0.0001
    param Type
    Hazard Ratio (HR)
    param Value
    0.231
    statistical Comment
    The treatment effect was tested with an unstratified log rank test.
    statistical Method
    Log Rank
Complete source fields
analyses
  1. ci Lower Limit
    0.145
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    0.367
    estimate Comment
    The hazard ratio and its 95% confidence interval were estimated using a Cox regression model with treatment as the only covariate.
    group Description
    To preserve the study wise type I error rate of 0.05, the primary and secondary endpoints were tested based on serial gatekeeping testing procedure at the two-sided significance level of 0.05 according to the hierarchical order of the primary analysis outcome measures presented in this record.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    p Value
    <0.0001
    param Type
    Hazard Ratio (HR)
    param Value
    0.231
    statistical Comment
    The treatment effect was tested with an unstratified log rank test.
    statistical Method
    Log Rank
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        69.5
        upper Limit
        85.2
        value
        78.5
      2. group Id
        OG001
        lower Limit
        22.5
        upper Limit
        40.0
        value
        31.1
denoms
  1. counts
    1. group Id
      OG000
      value
      113
    2. group Id
      OG001
      value
      116
    units
    Participants
description
PFS was defined as time from the date randomization to the date of first IRC-confirmed disease progression (PD) or date of death due to any cause, whichever occurred first, regardless of the use of subsequent antineoplastic therapy prior to documented PD or death. Assessment of PD was conducted in accordance with the International Workshop on Chronic Lymphocytic Leukemia (IWCLL) 2008 criteria (Halleck et al) with the modification that treatment-related lymphocytosis in the absence of other signs or symptoms of disease progression was not considered progressive disease. The primary analysis was performed after observing 94 PFS events as pre-specified in the study protocol. As the median PFS was not reached in the experimental (IBR+OB) arm at the time of the analysis, Kaplan Meier landmark estimates of the PFS rate at 30 months (that is, the estimated percentage of participants with progression-free survival at Month 30) are presented.
dispersion Type
95% Confidence Interval
groups
  1. description
    Ibrutinib (IBR) given orally at a dose of 420 mg/day until progressive disease or unacceptable toxicity. Intravenous obinutuzumab (OB) given on Days 1 and 2 (100 mg on Day 1 and 900 mg on Day 2), 1000 mg on Days 8 and 15 of Cycle 1 and 1000 mg on Day 1 of each cycle up to 6 cycles or until progressive disease or unacceptable toxicity.
    id
    OG000
    title
    IBR+OB
  2. description
    Chlorambucil (CLB) given orally at a dose of 0.5 mg/kg body weight up to a total of 6 cycles on Days 1 and 15 of each cycle or until disease progression or unacceptable toxicity. Intravenous obinutuzumab (OB) given on Days 1 and 2 (100 mg on Day 1 and 900 mg on Day 2), 1000 mg on Days 8 and 15 of Cycle 1 and 1000 mg on Day 1 of each cycle up to 6 cycles or until disease progression or unacceptable toxicity.
    id
    OG001
    title
    CLB+OB
param Type
NUMBER
population Description
Intent to Treat population: all randomized participants
reporting Status
POSTED
time Frame
Month 30 (Median follow-up time was 31.3 months at the time of the primary analysis [data cutoff date: 26 March 2018]).
title
Primary Analysis: Progression Free Survival (PFS) Based on Independent Review Committee (IRC) Assessment - Kaplan Meier Landmark Estimates at Month 30
type
PRIMARY
unit Of Measure
percentage of participants

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Preserved source evidence · Not medical advice