Prognostic Value Related to the Presence of Thrombosis or Portal Vein Invasion in Patients With Hepatocellular Carcinoma Submitted to Surgery

Inclusion Criteria: * hepatocellular carcinoma confirmed by imaging or histological specimen underwent surgical resection, with or without hepatic cirrhosis association; * presence of venous outflow obstruction, either by direct tumor invasion or thrombosis, on portal vein or one of its main vessels; Exclusion Criteria: * Patients undergoing prior systemic treatment; * Patients presenting incomplete data that do not allow their classification according to the stratification models; * Patients whose information of progression or death can not be recovered;