Figure 1. Overall survival curves of four groups of patients with stage IVA HCC. Gp 1, tumors involving a major branch of the portal or hepatic veins; Gp 2, invasion of adjacent organs; Gp 3, multiple tumors in more than one lobe; Gp 4, perforation of visceral peritoneum. P < .05 for comparisons between Gp 1 and Gp 2, 3, or 4; no significant differences among Gp 2, 3, and 4.