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NCT00085735 · OUTCOME

Local Posterior Fossa (LPF) Failure Rate

Comparison of Radiation Therapy Regimens in Combination With Chemotherapy in Treating Young Patients With Newly Diagnosed Standard-Risk Medulloblastoma · Source last updated 2026-06-09

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

Measure
NUMBER
Unit
percentage 3 yr cumulative incidence
Interval / dispersion
95% Confidence Interval
Time frame
3 years

What was measured

LPF failure was defined as tumor recurrence/progression within the tumor bed. The cumulative incidence (CI) of LPF failure was estimated; 3-year estimates were reported with 95% confidence intervals. Patients with other failure types (e.g., NPF) and with other events prior to LPF failure (e.g., death, second malignancy) were considered as having competing events.

Analysis population: Eligible and evaluable patients 3-21 yrs of age are included. Patients with anaplastic histology or disseminated/excess residual disease were not evaluable (NE). Arms I/III/V \[IFRT\] are combined \& arms II/IV/VI \[PFRT\] are combined. 26 \& 23 IFRT \& PFRT pts were NE and were excluded, leaving 227 and 237 eligible and evaluable pts.

Groups in this outcome

Involved Field Radiation (IFRT)

Includes eligible patients 3-21 years of age without anaplastic histology or evidence of disseminated or ERD based on central review and randomized to one of the IFRT arms (Treatment Arms I, III, V)

Posterior Fossa Radiation (PFRT)

Includes eligible patients 3-21 years of age without anaplastic histology or evidence of disseminated or ERD based on central review and randomized to one of the PFRT arms (Treatment Arms II, IV, VI)

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

Analysis denominator · Participants

GroupSource count
Involved Field Radiation (IFRT)227
Posterior Fossa Radiation (PFRT)237

Reported measurements

Source class 1
Values in percentage 3 yr cumulative incidence · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Involved Field Radiation (IFRT)1.4Not reported0.02.89Not reported
Posterior Fossa Radiation (PFRT)2.7Not reported0.64.9Not reported
Complete source fields
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        0.0
        upper Limit
        2.89
        value
        1.4
      2. group Id
        OG001
        lower Limit
        0.6
        upper Limit
        4.9
        value
        2.7
denoms
  1. counts
    1. group Id
      OG000
      value
      227
    2. group Id
      OG001
      value
      237
    units
    Participants
description
LPF failure was defined as tumor recurrence/progression within the tumor bed. The cumulative incidence (CI) of LPF failure was estimated; 3-year estimates were reported with 95% confidence intervals. Patients with other failure types (e.g., NPF) and with other events prior to LPF failure (e.g., death, second malignancy) were considered as having competing events.
dispersion Type
95% Confidence Interval
groups
  1. description
    Includes eligible patients 3-21 years of age without anaplastic histology or evidence of disseminated or ERD based on central review and randomized to one of the IFRT arms (Treatment Arms I, III, V)
    id
    OG000
    title
    Involved Field Radiation (IFRT)
  2. description
    Includes eligible patients 3-21 years of age without anaplastic histology or evidence of disseminated or ERD based on central review and randomized to one of the PFRT arms (Treatment Arms II, IV, VI)
    id
    OG001
    title
    Posterior Fossa Radiation (PFRT)
param Type
NUMBER
population Description
Eligible and evaluable patients 3-21 yrs of age are included. Patients with anaplastic histology or disseminated/excess residual disease were not evaluable (NE). Arms I/III/V \[IFRT\] are combined \& arms II/IV/VI \[PFRT\] are combined. 26 \& 23 IFRT \& PFRT pts were NE and were excluded, leaving 227 and 237 eligible and evaluable pts.
reporting Status
POSTED
time Frame
3 years
title
Local Posterior Fossa (LPF) Failure Rate
type
SECONDARY
unit Of Measure
percentage 3 yr cumulative incidence

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Preserved source evidence · Not medical advice