The Regeneration Paradox in Liver Cancer: How Chronic Injury Transforms Healing into Carcinogenesis

Area of Science:

• Hepatology
• Cancer Biology
• Regenerative Medicine

Background:

• The liver has remarkable regenerative capacity but is highly susceptible to cancer, particularly hepatocellular carcinoma (HCC), following chronic injury.
• Most HCC cases (85-90%) originate from chronic liver disease, yet a unifying explanation for this paradox remains elusive.

Purpose of the Study:

• To propose a novel framework explaining how liver regeneration contributes to HCC development.
• To elucidate the molecular mechanisms by which prolonged activation of regenerative pathways leads to cancer.

Main Methods:

• Analysis of molecular pathways involved in liver regeneration after acute versus chronic injury.
• Correlation of pathway activation duration with cancer incidence in clinical scenarios (e.g., living donor hepatectomy, chronic HCV infection).
• Identification and characterization of 'corruptions' that accumulate during chronic regeneration.

Main Results:

• HCC arises not from regeneration failure but from its prolonged activation, where pathways safe for weeks become carcinogenic over decades.
• Chronic regeneration accumulates seven specific molecular and cellular 'corruptions' (e.g., mutational accumulation, clonal expansion, epigenetic changes).
• Clinical data show stage-dependent reversibility of HCC risk, with early intervention (HCV cure at F0-F1) preventing >95% of cancers and late intervention (F4 cirrhosis) reducing risk by 70%.

Conclusions:

• The duration of regenerative pathway activation, not the pathway itself, dictates whether regeneration is protective or oncogenic.
• Viewing HCC pathways as persistently "ON" regenerative processes enables targeted therapies.
• Precision prevention and treatment of HCC are achievable by addressing the specific corruptions and intervening early.