IDH1 and neoplasm: Genetic analysis for tumor IDH1 mutational status and 1p/19q status was available for 57 patients: 20 patients were IDH1wt (35.1%), 19 were IDH1-mutant but had no 1p/19q codeletion, (33.3%), and 18 were IDH1-mutant and 1p/19q codeleted (31.6%).