Background and Objectives: Previous studies showed that the frequency of bcatenin mutation was different in mice when induced by different chemicals. The aim of this study is to compare the expression of b-catenin and p53 in hepatocellular carcinoma (HCC) from areas with exposure to high and low levels of aflatoxin B1 (AFB1). Methods: Thirty-five and twenty HCC samples from Guangxi and Malaysia, respectively,were studied. The expression of b-catenin and p53 was determined by immunohistochemistry. Results: The overexpression of b-catenin was detected in 65.7% of HCC tissues and 37.1% in adjacent liver tissues samples from Guangxi, China. Similarly, overexpression of b-catenin was also detected in 60.0% of HCC tissues and in 35.0% of
adjacent liver tissues samples from Malaysia. The overexpression of p53 was detected in 42.9% of HCC specimens from Guangxi and in 25.0% of HCC specimens from
Malaysia. There was a relationship between the expression of b-catenin and hepatitis B virus (HBV) infection in the adjacent liver tissues in Guangxi, and between the
expression of b-catenin and p53 in HCC tissues in Malaysia.
Conclusions: The differences in the exposure to AFB1 did not affect the overexpression of b-catenin in the development of HBV-associated HCC.