AFP and neoplasm: The results of the Chi-square test indicated that survival status (P < 0.05), tumor histological grade (G1, G2, G3, and G4, P < 0.01), vascular invasion situation (none, microvascular, and macrovascular invasion, P < 0.05), and AFP level (≤400 μg/L and >400 μg/L, P < 0.01) existed significant difference between high-risk and low-risk groups (Figure 4(c)).