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原发性肝癌是江苏省海安县三大恶性肿瘤之—，１９９８年海安县肝癌死亡率为５３．２５／ １０万。原发性肝癌的危险因素随地理位置不同而有差异［１］。为探讨肝癌在海安县高发的原因，找出危险因素，为海安县肿瘤防治工作提供决策依据，于１９９９年进行了１：１病例对照流行
Primary liver cancer is one of the three major malignancies in Hai’an County, Jiangsu Province. In 1998, the liver cancer death rate in Hai’an County was 53.25 / 100,000. The risk factors for primary liver cancer vary with geographical location [1]. In order to explore the reasons for the high incidence of liver cancer in Haian County, identify the risk factors for the prevention and treatment of cancer in Hai’an County to provide a basis for decision-making in 1999, a 1: 1 case-control prevalence