GliomaBrain NeoplasmsCase-Control StudiesHypersensitivityPolymorphism, Single NucleotideMeningiomaGenetic Predisposition to DiseaseGlioblastomaRisk FactorsGenetic Association StudiesGenotypeDNA HelicasesAsian Continental Ancestry GroupOdds RatioAllelesAstrocytomaOptic Nerve GliomaBrain Stem NeoplasmsCell Line, TumorDacarbazineTumor Cells, CulturedAntineoplastic Agents, Alkylating