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. 2010 Jan 25;12(4):401–408. doi: 10.1093/neuonc/nop047
RPA class Number of patients Median OS in the trial (mo) Expected median OS (mo)
4 (GBM, <50 y, KPS 90-100) 1 13.7 10.4
5 (GBM, <50 y, KPS 60-80) 6 5.6 5.6
6 (GBM, > 50 y, no steroids) 4 6.1 6.4
7 (GBM, > 50 y, taking steroids) 23 6.0 4.9

Abbreviations: KPS, Karnofsky performance status; GBM, glioblastoma; RPA, recursive partitioning analysis; OS, overall survival.