When these patients were divided into 2 groups according to the degree of accumulation of Lipiodol in the PVTT as shown on CT (type IV + type III, the low accumulation group, n = 28 + 22 = 50; and type II + type I, the high accumulation group, n = 8 + 19 = 27), there were no significant differences between the 2 groups in age, gender, hepatitis serology, liver function parameters, AFP level, number of TACE sessions, tumor characteristics and PVTT classification (Table 2). The gene discussed is AFP; the disease is neoplasm.