Precursor Lesions in Hepatocellular Carcinogenesis

The development of hepatocellular carcinoma (HCC) in a chronically diseased liver, often referred to as hepatocarcinogenesis, is a complex process characterized by the progressive accumulation and interaction of genetic alterations, leading to abnormal growth, malignant transformation of liver parenchymal cells, followed by vascular invasion and metastasis.

Precancerous conditions of the liver comprise a spectrum of histopathological and clinical entities that confer a significantly elevated risk of progression to primary hepatic malignancy, most notably HCC and, less commonly, intrahepatic cholangiocarcinoma. These states are characterised not by overt malignant transformation but by molecular, architectural, and cytological alterations that create a permissive environment for oncogenesis. Parasitic infection must likewise be recognised within this framework. Chronic hepatosplenic schistosomiasis due to Schistosoma mansoni induces longstanding granulomatous inflammation and periportal fibrosis. The basic hepatic architecture, including the hepatic lobules and their zonation, is illustrated in Figure 1. Although the parasite does not directly transform hepatocytes, the resultant portal hypertension, chronic immune activation, and fibrotic remodelling create a milieu that may facilitate hepatocarcinogenesis, particularly in conjunction with viral hepatitis or other hepatic insults. Thus, S. mansoni infection constitutes an indirect but clinically relevant precancerous condition in endemic regions.

In sum, precancerous situations in the liver are less discrete lesions than dynamic pathological states marked by chronic injury, regeneration, and molecular derangement. Their clinical significance resides in the imperative for vigilant surveillance, timely intervention, and, where feasible, modification of underlying aetiological factors. This review discusses HCC precursor lesions associated with a selection of regulatory networks important for liver regeneration, cell cycle control, and their potential significance in the pathogenesis of HCC with special emphasis on Schistosomiasis.