IDH1 and neoplasm: The factors correlated with longer OS included age ≤40 (P<0.001), KPS ≥70 (P=0.006), total resection of tumor (P=0.001), tumor size <6 cm (P=0.034), Ki-67 <20% (P<0.001), lower tumor grade (P<0.001), 1q/19p co-polysomy (P<0.001), no single polysomy (P<0.001), and IDH1/2 mutation (P=0.001).