{"denomUnitsSelected":"Participants","description":"Per protocol, cell-free DNA based assay was to be used to determine whether Hist1H3B K27M mutation could be detected in patients' urine samples, and percentage of patients in whom this mutation was detected would be summarized within each stratum and at each time point. With current technologies available to the lab, no patients had cell-free DNA assay results from urine samples.","reportingStatus":"NOT_POSTED","timeFrame":"Urine samples were collected for cell-free DNA based assay at Course 1 Day 1 (C1D1), C2D1, C4D1, and C6D1.","title":"Percentage of Patients With Hist1H3B K27M Mutation Detected in Urine Samples","type":"SECONDARY"}