随着人们生活水平的提高和预期寿命的延长,肿瘤已成为继心脑血管疾病后的第二大杀手。肿瘤的发生原因极其复杂,既有遗传因素的作用,又受环境致癌因素的影响。以家族性胃癌为例,同一家庭内可有多个成员先后发生胃癌,其除了遗传因素起作用外,与家庭成员的相同生活及饮 With the improvement of people’s living standards and life expectancy, cancer has become the second largest killer after cardiovascular and cerebrovascular diseases. The causes of cancer is extremely complicated, both the role of genetic factors, but also by the impact of environmental carcinogens. In familial gastric cancer, for example, multiple members of the same family may have gastric cancer, which acts in addition to genetic factors and lives and drinks the same as family members