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Kaplan-Meier estimates of overall survival by genotype for radiotherapy arm. The hazard ratio (HR) for overall survival of patients with 1p/19q codeleted anaplastic oligodendroglioma (AO)/anaplastic oligoastrocytoma (AOA) compared with those with AO/AOA in whom one or neither allele was deleted was 0.40 (95% CI, 0.27 to 0.60; P < .001).
