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Kaplan-Meier curves showing overall survival for (A) the Memorial Sloan-Kettering Cancer Center (MSKCC) + Cleveland Clinic Foundation (CCF) data set split according to subgroups derived from its RPA; (B) the French data set split according to subgroups derived from MSKCC + CCF RPA. Abbreviations: KPS=Karnofsky performance status; PR=partial resection; GTR=gross total resection
