Figure 1

Survival curves according to portal vein invasion in the resected liver specimen. No portal vein invasive disease is denoted as "port (-)". Invasion confined to the portal vein is arbitrarily designated as "port (+)". Portal vein invasion was observed in 8 patients with the significant worse 3- and 5 year survival when compared with those without portal invasion (28.6% and 0% vs. 66.2% and 63.4%, respectively, P = 0.0074).