In this study, we found that the mutant genes in the metastatic brain tumors included ALK, MDM2, ATM, BRCA1, FGFR1, and KRAS, and there were no glioma-related mutant genes (MGMT, IDH1, IDH2, 1p/19q, BRAF, and TERT). The gene discussed is IDH2; the disease is glioma.