BACKGROUND/AIM: To investigate the roles of mutations in pre-S and S regions of hepatitis B virus (HBV) on the progression of hepatocellular carcinoma (HCC) in Qidong. China. METHODS: We conducted an age matched case-control study within a cohort of 2387 male HBV carriers who were recruited from August. 1996. https://allfixelectricales.shop/product-category/turntable-drive-button/