Histopathological components correlated with MRI features and prognosis in combined hepatocellular carcinoma-cholangiocarcinoma.

ABSTRACT

OBJECTIVES: To distinguish MR features according to different proportions of the histopathological hepatocellular carcinoma (HCC) component and to investigate whether the proportion of the HCC component can predict the prognosis of patients with cHCC-CCA. METHODS: The study enrolled 106 cHCC-CCA patients confirmed by histopathology. The MR imaging features and clinicopathological findings were retrospectively evaluated and compared between two subgroups with different proportions of the HCC component. The recurrence-free survival (RFS) and overall survival (OS) were evaluated using Kaplan-Meier survival curves and compared using the log-rank test. Moreover, whether the proportion of the HCC component was a predictor of RFS and OS was investigated using Cox regression analyses. RESULTS: The Liver Imaging Reporting and Data System (LI-RADS) category 4/5 was more prevalent in cHCC-CCAs with an HCC component > 50% (odds ratio (OR) = 5.559, p = 0.018), 70% (OR = 4.031, p = 0.008), and 90% (OR = 6.282, p = 0.012) than in those with an HCC component ≤ 50%, 70%, and 90%, respectively. In addition, cHCC-CCAs with an HCC component > 70% (HR 0.241, p = 0.023) had a better OS prognosis than those with an HCC component ≤ 70%. CONCLUSIONS: cHCC-CCAs categorized as LR-4/5 are mainly composed of HCC component, and cHCC-CCAs with an HCC component > 70% are associated with better OS than those with an HCC component ≤ 70%. These findings suggest that the proportion of HCC or CCA component can predict the prognosis of cHCC-CCA patients. KEY POINTS • cHCC-CCAs categorized as LR-4/5 are mainly composed of HCC component. • cHCC-CCAs with an HCC component > 70% are associated with better OS than those with an HCC component ≤ 70%.