Resection of Mixed Hepatocellular-Cholangiocarcinoma, Hepatocellular Carcinoma, and Intrahepatic Cholangiocarcinoma.

Mixed hepatocellular-cholangiocarcinoma (HCC-CC) is a biphenotypic liver cancer thought to have unfavorable tumor biology and a poor prognosis. Surgical outcomes of HCC-CC remain unclear. We aimed to evaluate the clinical characteristics and surgical outcomes of HCC-CC. We analyzed a series of patients undergoing resection for HCC-CC (n = 47), hepatocellular carcinoma (HCC; n = 468), and intrahepatic cholangiocarcinoma (ICC; n = 108) at a single Western center between 2001 and 2015. Patients with HCC-CC were matched to patients with HCC and ICC on important clinical factors including tumor characteristics (size, vascular invasion, and differentiation) and underlying cirrhosis. Patients with HCC-CC had rates of viral hepatitis comparable to patients with HCC (78.7% versus 80.0%), and 42.5% had underlying cirrhosis. When matched on tumor size, HCC-CC was more poorly differentiated than HCC (68.3% versus 27.3%; P < 0.001) and ICC (68.3% versus 34.8%; P = 0.01) but had similar postresection survival (5-year survival: HCC-CC 49.7%, HCC 54.8%, ICC 68.7%; P = 0.61) and recurrence (3-year recurrence: HCC-CC 57.9%, HCC 61.5%, and ICC 56%; P = 0.58). Outcomes were similar between HCC-CC and HCC when matched on underlying cirrhosis and tumor size. Cancer type was not predictive of survival or tumor recurrence. Survival after resection of HCC-CC is similar to HCC when matched for tumor size, despite HCC-CC tumors being more poorly differentiated. Exclusion of HCC-CC from management strategies recommended for HCC, including consideration for liver transplantation, may not be warranted.