When we split the data according to IDH1 mutation status, there was no statistically significant difference in MMSE concentration-calculation, TMT B, and DS backwards means between the left-hemisphere and right-hemisphere tumor patients neither for the IDH1 mutant group (p = .10, p = .45, and p = .31, respectively) nor for the IDH1 wild one (p = .08, p = .20, and p = .28, respectively). This evidence concerns the gene IDH1 and neoplasm.