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NCT01143038 · OUTCOME

Number of Months With Platelet Response During the 12-Month Treatment Period

Interventional Study in Adults With Immune Thrombocytopenia Purpura (ITP) Receiving Romiplostim · Source last updated 2022-09-21

Results reported by the registry submitting party. Population, time horizon, units and missing values must be read together.

Measure
MEAN
Unit
months
Interval / dispersion
Standard Error
Time frame
12 months

What was measured

The primary endpoint was the number of months a participant achieved a platelet response during the 12-month treatment period. A platelet response for any 1 month was defined as the median of platelet counts measured in the month ≥ 50 x 10\^9/L. Platelet counts within 4 weeks following a rescue medication use or following splenectomy were considered non-response. Months without any platelet count measurement were considered as months with no platelet response.

Analysis population: Safety Analysis Set includes all participants who received at least 1 dose of romiplostim.

Groups in this outcome

Romiplostim

Participants received romiplostim administered weekly by subcutaneous injection during the 12-month treatment period. The starting dose was 1 μg/kg with weekly dose increases in increments of 1 μg/kg/week to a maximum dose of 10 μg/kg to reach a target platelet count of ≥ 50 x 10\^9/L. At the completion of the 12-month treatment period, participants receiving only romiplostim and with a platelet count ≥ 50 x 10\^9/L entered the tapering period, during which the romiplostim dose was decreased by 1 µg/kg every 2 weeks, for up to 19 weeks. Participants who had tapered off treatment with romiplostim and whose platelet count dropped below 50 x 10\^9/L could reinitiate romiplostim for up to 8 weeks.

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

Analysis denominator · Participants

GroupSource count
Romiplostim75

Reported measurements

Source class 1
Values in months · Interval/dispersion: Standard Error
GroupValueSpreadLowerUpperComment
Romiplostim9.20.4Not reportedNot reportedNot reported

Source statistical analyses

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

  1. ci Lower Limit
    8.3
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    10.1
    estimate Comment
    Based on the t-distribution
    group Ids
    1. OG000
    non Inferiority Type
    SUPERIORITY_OR_OTHER_LEGACY
    param Type
    Mean
    param Value
    9.2
  2. ci Lower Limit
    8.3
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    10.0
    dispersion Type
    STANDARD_ERROR_OF_MEAN
    dispersion Value
    0.4
    estimate Comment
    Estimates are based on bootstrap method with 1000 samples with replacement.
    group Description
    Bootstrap analysis
    group Ids
    1. OG000
    non Inferiority Type
    SUPERIORITY_OR_OTHER_LEGACY
    param Type
    Bootstrap mean
    param Value
    9.1
Complete source fields
analyses
  1. ci Lower Limit
    8.3
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    10.1
    estimate Comment
    Based on the t-distribution
    group Ids
    1. OG000
    non Inferiority Type
    SUPERIORITY_OR_OTHER_LEGACY
    param Type
    Mean
    param Value
    9.2
  2. ci Lower Limit
    8.3
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    10.0
    dispersion Type
    STANDARD_ERROR_OF_MEAN
    dispersion Value
    0.4
    estimate Comment
    Estimates are based on bootstrap method with 1000 samples with replacement.
    group Description
    Bootstrap analysis
    group Ids
    1. OG000
    non Inferiority Type
    SUPERIORITY_OR_OTHER_LEGACY
    param Type
    Bootstrap mean
    param Value
    9.1
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        spread
        0.4
        value
        9.2
denoms
  1. counts
    1. group Id
      OG000
      value
      75
    units
    Participants
description
The primary endpoint was the number of months a participant achieved a platelet response during the 12-month treatment period. A platelet response for any 1 month was defined as the median of platelet counts measured in the month ≥ 50 x 10\^9/L. Platelet counts within 4 weeks following a rescue medication use or following splenectomy were considered non-response. Months without any platelet count measurement were considered as months with no platelet response.
dispersion Type
Standard Error
groups
  1. description
    Participants received romiplostim administered weekly by subcutaneous injection during the 12-month treatment period. The starting dose was 1 μg/kg with weekly dose increases in increments of 1 μg/kg/week to a maximum dose of 10 μg/kg to reach a target platelet count of ≥ 50 x 10\^9/L. At the completion of the 12-month treatment period, participants receiving only romiplostim and with a platelet count ≥ 50 x 10\^9/L entered the tapering period, during which the romiplostim dose was decreased by 1 µg/kg every 2 weeks, for up to 19 weeks. Participants who had tapered off treatment with romiplostim and whose platelet count dropped below 50 x 10\^9/L could reinitiate romiplostim for up to 8 weeks.
    id
    OG000
    title
    Romiplostim
param Type
MEAN
population Description
Safety Analysis Set includes all participants who received at least 1 dose of romiplostim.
reporting Status
POSTED
time Frame
12 months
title
Number of Months With Platelet Response During the 12-Month Treatment Period
type
PRIMARY
unit Of Measure
months

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Preserved source evidence · Not medical advice