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Corticosteroid use at the start of radiotherapy without or with TMZ is an independent marker of poor prognosis in human glioblastoma patients from three independent cohorts. Overall survival of (A) MSKCC; (B) EORTC 26981/22981 NCIC CE.3; and (C) GGN patient cohorts. RT = radiotherapy. O = total observed events; n = total number of patients.
