[The epidemiological study of subtype risk factors of gastric cancer].

On the basis of understanding multistage pattern of the development of gastric cancer, we designed and carried out a new case-control study. The methods of analysis was multigroup logistic regression analysis. The studied objects were 4 groups of cases and 1 group of control. They were gastric Cancer group, severe dysplasia group, chronic atrophic gastritis accompanied by intestinal metaplasia group, ulcer group and control group, respectively. The control group was confirmed by pathology which showed that the gastric mucosa was normal or had only mild chronic superficial gastritis. The results showed that the risk factors of gastric cancer were living in high incidence area for a long period, low economic income, low animal protein intake, high sweet potato and inkfish intake, eating and drinking too much at one meal and mental injuring. The risk factors of severe dysplasia were low intake of protein, intake of non-fresh fish, large intake of inkfish and salted meat, a family history of gastric cancer.