Pathological prognostic factors for post-resection survival in patients with hepatocellular carcinoma associated with non-alcoholic fatty liver disease

BACKGROUND: The incidence of hepatocellular carcinoma (HCC) in patients with non-alcoholic fatty liver disease (NAFLD) is steadily increasing. However, little is known about the characteristics of these patients or the factors affecting their prognosis. Our aim was to evaluate the pathological prognostic factors associated with survival in NAFLD patients. METHODS: This was a retrospective cohort study of 575 patients who underwent resection of HCC between January 2004 and December 2018. HCC was associated purely with NAFLD or hepatitis B virus (HBV) based on the pathology and viral markers. The pathological markers of HCC were compared between patients with pure NAFLD and patients with pure HBV. RESULTS: The pathological factors were similar between the two groups. There were no differences in overall survival (OS; P=0.283) or recurrence-free survival (RFS; P=0.990) between the pure NAFLD and pure HBV groups. The NAFLD group had a similar local RFS (P=0.785) but a better systemic RFS compared with the HBV group, (P=0.089). In multivariable analysis using bootstrapping with resampling and replacement of data, no single factor was significantly associated with RFS. However, the Ki-67 labeling index [P=0.022; bootstrap 95% confidence interval (CI): 0.000–0.919] was the only independent factor associated with systemic recurrence in the NAFLD group. CONCLUSIONS: In patients with HCC associated with NAFLD, the Ki-67 labeling index determined by immunohistochemistry may predict the risk of systemic recurrence following resection, allowing for stricter monitoring protocols for such patients.