Use the GEPIA database to verify 19 extracted core genes (KIF2C, CDC20, TPX2, TK1, CDKN3, CENPF, TOP2A, TRIP13, CDCA5, ASPM, MELK, NCAPG, PRC1, HJURP, AUPKA, KF20A, KIF4A, PTTG1, CCNA2, MCM2) Expression levels in HCC patients and normal subjects. The gene discussed is PTTG1; the disease is hepatocellular carcinoma.