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Improved unadjusted OS estimates with GTR. GTR (solid line; n = 269) of WHO grade II 1p/19q-codeleted oligodendrogliomas demonstrated significantly improved unadjusted OS compared with biopsy-only (dotted line; n = 113) or STR (dashed line; n = 131) in Kaplan–Meier estimates (log-rank test P = 0.03; with the corresponding number-at-risk table).
