Background: The impact of different causative factors of intrahepatic cholangiocarcinoma (ICC) on disease outcome remains largely unknown. This study aimed to evaluate the prognosis of ICC patients with different pathogenic factors after hepatectomy.
Methods: Data of 731 consecutive patients undergoing R0 liver resection for ICC at The Eastern Hepatobiliary Surgery Hospital between 2004 and 2010 were analyzed. These patients were divided into the hepatitis B virus-related (HBV-ICC, n = 519), hepatolithiasis-related (stone-ICC, n = 87), HBV plus hepatolithiasis-related (HBV/stone-ICC, n = 45), and other etiologies-related (other-ICC, n = 80) ICC groups. Propensity score matching (PSM) was used to eliminate the baseline differences between these groups.
Results: In these four groups, the 5-year tumor recurrence and overall survival (OS) rates were 75.4, 90.3, 83.0 and 81.9%, and 32.7, 16.3, 17.7 and 22.6%, respectively. The significant differences in recurrence and OS were identified between the HBV- and stone-ICC groups (both p < 0.001). In these two groups, most of the independent prognostic predictors were similar, but tumor diameter >5 cm was demonstrated as a risk factor in the HBV-ICC patients only, and surgical margin <1 cm and human epidermal growth factor receptor 2-positive were demonstrated as risk factors in the stone-ICC patients only. With PSM, 75 patients in each of the HBV- and stone-ICC cohorts were created, and the 5-year recurrence and OS rates were 69.9 versus 88.6, and 34.6 versus 19.2%, respectively (p = 0.017, 0.027).
Conclusion: Patients with HBV-ICC achieved better outcomes than those with stone-ICC. This prognostic difference was probably associated with biological malignant invasiveness rather than tumor stage.