Clinicopathologic study on clear cell hepatocellular carcinoma

Area of Science:

• Hepatobiliary Pathophysiology
• Oncology
• Cellular Biology

Background:

• Hepatocellular carcinoma (HCC) is a primary liver malignancy with various subtypes.
• The clear cell variant of HCC presents unique clinicopathologic features requiring detailed investigation.
• Understanding these features is crucial for accurate diagnosis and patient management.

Purpose of the Study:

• To investigate the clinicopathologic characteristics of clear cell hepatocellular carcinoma (HCC).
• To compare clear cell HCC with focal clear cell HCC and non-clear cell HCC.
• To evaluate the prognostic implications of the clear cell variant.

Main Methods:

• Retrospective review of 215 HCC cases (<5 cm diameter).
• Classification into clear cell HCC (20 cases), focal clear cell HCC (77 cases), and non-clear cell HCC (118 cases).
• Comparative analysis of clinical, pathological, and ultrastructural findings, including survival rates.

Main Results:

• Clear cell HCC is often moderately differentiated (80%) and not size-dependent.
• It exhibits a lower male-to-female ratio (2.3:1) and higher liver cirrhosis association (90%) than non-clear cell HCC.
• Ultrastructurally, clear cells show abundant glycogen and fat vacuoles with reduced organelles; glycogen storage differs significantly between clear and non-clear cells.

Conclusions:

• Clear cell HCC is characterized by moderate differentiation, higher female prevalence, and strong association with liver cirrhosis.
• Prognosis, including survival and recurrence rates, shows no statistically significant difference between clear cell and non-clear cell HCC.
• Distinct ultrastructural features, particularly glycogen storage, differentiate clear cell HCC from other variants.