问：甲氰咪呱能引起胃癌吗？答：近年来国外报告三例病人，服用甲氰咪呱10周至6个月，内窥镜检查发现胃癌，并经手术证实。据认为，甲氰咪呱可能在酸性环境容易亚硝基化而成为致癌物质。这一报导虽在国内外引起关注，但也有人持不同意见，认为亚硝基化仅发生在高酸情况下，而甲氰咪呱治疗时胃酸是低的。甚至有人认为胃内亚硝基化作用产 Q: Cimetidine can cause stomach cancer? A: In recent years, three cases of foreign reports of patients, taking cimetidine 10 weeks to 6 months, endoscopy found gastric cancer, and confirmed by surgery. It is believed that cimetidine may be easily nitrosated in an acidic environment to become a carcinogen. Although this report has drawn some attention both at home and abroad, others disagree that nitrosation only occurs in the presence of high-acid conditions, and that gastric acid is low during treatment with cimetidine. Some people even think nitrosylation effect of stomach production