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NCT00154102 · OUTCOME

Progression-free Survival (PFS) Time - Independent Review Committee (IRC) Assessments

Cetuximab Combined With Irinotecan in First-line Therapy for Metastatic Colorectal Cancer (CRYSTAL) · Source last updated 2017-01-30

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
Time from randomisation to disease progression, death or last tumour assessment, reported between day of first patient randomised, 10 Aug 2004, until cut-off date, 27 July 2006

What was measured

Duration from randomization until radiological progression (based on modified World Health Organisation (WHO) criteria) or death due to any cause. Only deaths within 60 days of last tumor assessment are considered. Patients without event are censored on the date of last tumor assessment.

Analysis population: Primary analysis on Intent to Treat (ITT) population i.e. all randomized subjects who have received at least one dose of randomized treatment (allocation to treatment groups as randomized).

Groups in this outcome

Cetuximab Plus FOLFIRI

Cetuximab intravenous infusion of 400mg/m\^2 for the first infusion then weekly intravenous infusion of 250mg/m\^2. Bi-weekly Irinotecan infusion of 180mg/m\^2, Folinic Acid infusion of 400mg/m\^2 (racemic) or 200mg/m\^2 (L-form), 5-Fluorouracil bolus of 400mg/m\^2 followed by a 46-hour continuous infusion of 2400mg/m\^2 Number of Cycles: until progression or unacceptable toxicity develops

FOLFIRI Alone

Bi-weekly Irinotecan infusion of 180mg/m\^2, Folinic Acid infusion of 400mg/m\^2 (racemic) or 200mg/m\^2 (L-form), 5-Fluorouracil bolus of 400mg/m\^2 followed by a 46-hour continuous infusion of 2400mg/m\^2 Number of Cycles: until progression or unacceptable toxicity develops

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

Analysis denominator · Participants

GroupSource count
Cetuximab Plus FOLFIRI599
FOLFIRI Alone599

Reported measurements

Source class 1
Values in months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Cetuximab Plus FOLFIRI8.9Not reported8.09.4Not reported
FOLFIRI Alone8.0Not reported7.69.0Not reported

Source statistical analyses

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

  1. ci Lower Limit
    0.728
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    1.000
    group Description
    The study was planned with 633 progression events, in order to provide 80% power to test the null hypothesis of no difference in PFS time between treatment groups, assuming a hazard ratio (HR) of 0.8 of cetuximab + chemotherapy (CTX) over CTX alone. Significance level was fixed at 5%. The two-sided stratified log-rank test was employed, considering the randomization strata (region: Western Europe, Eastern Europe, outside Europe and Karnovsky Performance Scale (KPS):\<80 vs. ≥80)
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY_OR_OTHER
    p Value
    0.0479
    param Type
    Hazard Ratio (HR)
    param Value
    0.853
    statistical Comment
    Kaplan-Meier method was used to estimate median PFS time. HR was calculated using Cox proportional hazards model stratified by randomization strata.
    statistical Method
    Stratified log rank
    tested Non Inferiority
    false
Complete source fields
analyses
  1. ci Lower Limit
    0.728
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    1.000
    group Description
    The study was planned with 633 progression events, in order to provide 80% power to test the null hypothesis of no difference in PFS time between treatment groups, assuming a hazard ratio (HR) of 0.8 of cetuximab + chemotherapy (CTX) over CTX alone. Significance level was fixed at 5%. The two-sided stratified log-rank test was employed, considering the randomization strata (region: Western Europe, Eastern Europe, outside Europe and Karnovsky Performance Scale (KPS):\<80 vs. ≥80)
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY_OR_OTHER
    p Value
    0.0479
    param Type
    Hazard Ratio (HR)
    param Value
    0.853
    statistical Comment
    Kaplan-Meier method was used to estimate median PFS time. HR was calculated using Cox proportional hazards model stratified by randomization strata.
    statistical Method
    Stratified log rank
    tested Non Inferiority
    false
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        8.0
        upper Limit
        9.4
        value
        8.9
      2. group Id
        OG001
        lower Limit
        7.6
        upper Limit
        9.0
        value
        8.0
denoms
  1. counts
    1. group Id
      OG000
      value
      599
    2. group Id
      OG001
      value
      599
    units
    Participants
description
Duration from randomization until radiological progression (based on modified World Health Organisation (WHO) criteria) or death due to any cause. Only deaths within 60 days of last tumor assessment are considered. Patients without event are censored on the date of last tumor assessment.
dispersion Type
95% Confidence Interval
groups
  1. description
    Cetuximab intravenous infusion of 400mg/m\^2 for the first infusion then weekly intravenous infusion of 250mg/m\^2. Bi-weekly Irinotecan infusion of 180mg/m\^2, Folinic Acid infusion of 400mg/m\^2 (racemic) or 200mg/m\^2 (L-form), 5-Fluorouracil bolus of 400mg/m\^2 followed by a 46-hour continuous infusion of 2400mg/m\^2 Number of Cycles: until progression or unacceptable toxicity develops
    id
    OG000
    title
    Cetuximab Plus FOLFIRI
  2. description
    Bi-weekly Irinotecan infusion of 180mg/m\^2, Folinic Acid infusion of 400mg/m\^2 (racemic) or 200mg/m\^2 (L-form), 5-Fluorouracil bolus of 400mg/m\^2 followed by a 46-hour continuous infusion of 2400mg/m\^2 Number of Cycles: until progression or unacceptable toxicity develops
    id
    OG001
    title
    FOLFIRI Alone
param Type
MEDIAN
population Description
Primary analysis on Intent to Treat (ITT) population i.e. all randomized subjects who have received at least one dose of randomized treatment (allocation to treatment groups as randomized).
reporting Status
POSTED
time Frame
Time from randomisation to disease progression, death or last tumour assessment, reported between day of first patient randomised, 10 Aug 2004, until cut-off date, 27 July 2006
title
Progression-free Survival (PFS) Time - Independent Review Committee (IRC) Assessments
type
PRIMARY
unit Of Measure
months

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Preserved source evidence · Independent clinical review pending · Not medical advice