{"classes":[{"categories":[{"measurements":[{"groupId":"OG000","value":"6"}]}]}],"denoms":[{"counts":[{"groupId":"OG000","value":"100"}],"units":"Participants"}],"description":"To monitor for treatment failure in the posterior fossa of patients whose tumor bed receives a reduced volume of radiation.","groups":[{"description":"Participants assigned to the average-risk arm had localized tumor without overt evidence of invasion beyond the posterior fossa. Participants with T4 disease met the following criteria: gross total resection defined as residual tumor or imaging abnormality whose size was \\<1.5 cm\\^2 on postoperative CT or MR images, no evidence of CNS or extraneural metastasis, and brain stem invasion by the tumor in the absence of imaging evidence of residual tumor (tumor size \\<1.5 cm\\^2).","id":"OG000","title":"Average-Risk Group"}],"paramType":"COUNT_OF_PARTICIPANTS","populationDescription":"Analysis included 100 average risk participants with a diagnosis of medulloblastoma who had cumulative radiotherapy dose profiles and treatment failure volumes data available. All participants included in analysis who were still at risk and on-study were followed for a minimum of 6 years. Participants with a diagnosis of PNET, PNET variants, or ATRT were not included in this analysis.","reportingStatus":"POSTED","timeFrame":"Annually for 6 years post irradiation","title":"Number of Average Risk Patients Whose Treatment Failure Included the Posterior Fossa","type":"SECONDARY","unitOfMeasure":"Participants"}