IDH1 and neoplasm: In IDH1-wildtype group, the tumor volume (r = −0.3473, P = 0.0066) and mean ADC value (r = −0.3059, P = 0.0175) based on FLAIR images were also significantly correlated with BCAT1 expression level, while no imaging parameters had significant correlation with BCAT1 expression level in IDH1-mutant group (Supplementary Table S2).