动物实验表明绿茶对肿瘤的发生有抑制作用。人群研究也发现绿茶与食管肿瘤危险性降低有关。但只有少数研究(且其样本量较少)探讨了绿茶与胃癌危险性的关系,结果均发现两者呈负相关。本文报道的是在上海进行的研究,其样本量均多于上述各研究。研究对 Animal experiments show that green tea has an inhibitory effect on tumorigenesis. The population study also found that green tea is associated with a reduced risk of esophageal cancer. However, only a few studies (and their small sample size) have examined the relationship between the risk of green tea and gastric cancer, and both have shown a negative correlation. This article reports on a study conducted in Shanghai and has more sample sizes than the above studies. Research pair