IDH2 and neoplasm: The NGS analysis of tumor tissue DNA showed the following results: in case 1, TP53 was 20.9%; in case 2, PIC3CA was 34.1%; in case 3, TP53 was 25.7%; in case 4, KRAS was 40%; in case 5, TP53 was 31.1%; in case 6, TP53 was 8.5%; in case 7, TP53 was 12.8%; in case 8, IDH2 was 1.1%; in case 9, AR was 1.5%; and in case 10, FGFR3 was 1.0% in frequency (Table 2).