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Follow-up data and patient outcomes. aOligodendroglioma to anaplastic oligodendroglioma, 3; oligodendroglioma to glioblastoma multiforme, 1; astrocytoma to anaplastic astrocytoma, 1; oligoastrocytoma to anaplastic oligodendroglioma, 1; astrocytoma to glioblastoma multiforme, 1. bAstrocytoma, 2; glioblastoma multiforme, 2
