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NCT02264574 · OUTCOME

Final Analysis: PFS Based on Investigator Assessment - Kaplan Meier Landmark Estimates at Month 48

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 48 (Median follow-up time was 44.6 months at the time of the final analysis [data cutoff date: 17 October 2019]).

What was measured

PFS was defined as time from the date randomization to the date of first investigator-confirmed 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. 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 48 months (that is, the estimated percentage of participants with progression-free survival at Month 48) 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+OB74.0Not reported64.381.4Not reported
CLB+OB22.0Not reported11.035.4Not reported

Source statistical analyses

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

  1. ci Lower Limit
    0.162
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    0.389
    estimate Comment
    The hazard ratio and its 95% confidence interval were estimated using a Cox regression model with treatment as the only covariate.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    p Value
    < 0.0001
    param Type
    Hazard Ratio (HR)
    param Value
    0.251
    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
    0.162
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    0.389
    estimate Comment
    The hazard ratio and its 95% confidence interval were estimated using a Cox regression model with treatment as the only covariate.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    p Value
    < 0.0001
    param Type
    Hazard Ratio (HR)
    param Value
    0.251
    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
        64.3
        upper Limit
        81.4
        value
        74.0
      2. group Id
        OG001
        lower Limit
        11.0
        upper Limit
        35.4
        value
        22.0
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 investigator-confirmed 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. 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 48 months (that is, the estimated percentage of participants with progression-free survival at Month 48) 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 48 (Median follow-up time was 44.6 months at the time of the final analysis [data cutoff date: 17 October 2019]).
title
Final Analysis: PFS Based on Investigator Assessment - Kaplan Meier Landmark Estimates at Month 48
type
PRIMARY
unit Of Measure
percentage of participants

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Preserved source evidence · Not medical advice