Improved postoperative survival for intraductal- growth subtype of intrahepatic cholangiocarcinoma

Abstract

Intrahepatic cholangiocarcinoma (ICC) is classified according to the following subtypes: massforming (MF), periductal infiltrating (PI), and intraductal growth (IG). The aim of this study is to measure the association between ICC subtypes and patient survival after surgical resection. Data were abstracted on all patients treated with definitive resections of ICC at a single institution between 2000 and 2011 with at least three years follow-up. Survival estimates were quantified using Kaplan-Meier curves and compared using the log-rank test. There were 37 patients with ICC treated with definitive partial hepatectomies with a median survival of 33.5 months. Tumor stage (P < 0.0001), satellitosis (P < 0.001), lymphovascular space invasion (P = 0.003), and macroscopic subtype (P = 0.003) were predictive of postoperative survival. Disease-free survivals for MF, PI, and IG subtypes, respectively, were 30 percent, 0 percent, and 57 percent (P = 0.017). Overall survivals among ICC macroscopic subtypes were as follows: MF 37 percent, PI 0 percent, and IG 71 percent (P = 0.003). Although limited by the small sample size of this rare cancer, this study demonstrates significant differences among macroscopic subtypes of ICC in both diseasefree survivals and overall survivals after definitive partial hepatectomy.