据历史记载,煤矿区居民的胃癌发病率较高。为了找出可能与高危地区患者发病有关的因素,特别是为了证明暴露于煤矿微粒及使用煤是否与患胃癌的危险性有关,在美国西部宾夕法尼亚州的煤矿区进行了病例对照研究。 According to historical records, residents of coal mining areas have a higher incidence of gastric cancer. A case-control study was conducted in the coal mines of Pennsylvania, western United States, in order to identify factors that may be associated with the onset of disease in high-risk areas, in particular, to demonstrate that exposure to coal mine particles and the use of coal are associated with the risk of gastric cancer.