国内外对胃癌的流行病学特点虽有所描述,但仍嫌不足。至于胃癌流行因素、病因及发病机理等,则更差。在胃癌病因尚未解决之前,对胃癌流行病学特点(分布规律)的研究有助于制订胃癌的预防措施。一、地区分布 (一)胃癌在世界各个国家或地区的分布不平衡,在各个时期的发病或死亡亦有较 Although the epidemiological characteristics of gastric cancer have been described at home and abroad, it is still insufficient. As for the epidemiological factors, etiology and pathogenesis of gastric cancer, it is even worse. Before the etiology of gastric cancer has been resolved, the study of epidemiological characteristics (distribution patterns) of gastric cancer can help to develop prevention measures for gastric cancer. I. Regional Distribution (I) The distribution of gastric cancer in various countries or regions of the world is unbalanced, and there are also more cases of morbidity or mortality in different periods.