Hepatocellular carcinoma: clinicopathological aspects

Area of Science:

• Hepatology
• Oncology
• Pathology

Background:

• Hepatocellular carcinoma (HCC) exhibits significant variability in clinical presentation and histopathology across different geographic regions and ethnic groups.
• These variations are potentially linked to underlying genetic alterations driving hepatocarcinogenesis.

Purpose of the Study:

• To compare the clinicopathological features of HCC between southern African blacks and Japanese populations.
• To identify and describe distinct clinicopathological subtypes of HCC and their associated clinical courses.

Main Methods:

• Comparative analysis of clinicopathological features of HCC.
• Description of distinct HCC subtypes including encapsulated, diffuse-type, sclerosing, fibrolamellar, and extrahepatic growth (pedunculated) HCC.
• Review of vascular and ductal invasion patterns.

Main Results:

• Significant differences in cirrhosis frequency, cancer differentiation grade, and clinical course were observed between southern African blacks and Japanese patients.
• Intra-abdominal bleeding and rapidly progressive HCC were more common in blacks, potentially due to the absence of encapsulated tumors.
• Distinct subtypes like diffuse-type HCC (fulminant course), sclerosing carcinoma (associated with hypercalcemia in the US), fibrolamellar carcinoma (common in the West), and pedunculated HCC were discussed.
• HCC frequently invades vessel and duct systems, with portal vein invasion being common and hepatic vein/inferior vena cava invasion less frequent. Intraductal invasion can cause jaundice and hemobilia.

Conclusions:

• Clinicopathological variations in HCC underscore the importance of regional and genetic factors in disease presentation.
• Recognition of distinct HCC subtypes and their specific invasion patterns is crucial for accurate diagnosis and prognosis.
• Further research into the genetic underpinnings of HCC heterogeneity is warranted to improve patient outcomes.