论文部分内容阅读
大肠癌是一种常见的消化道恶性肿瘤,在西方发达国家其发病率居恶性肿瘤的第2位。在我国,由于饮食习惯和生活方式的改变,大肠癌的发病率日渐增高,已跃居第3～5位,并呈逐渐上升趋势。大肠癌早期症状不明显,且病情发展缓慢,发现时多为晚期。因此,早期诊断早期治疗是重要的防治研究方向。大肠癌是一个多因素,内外因交互作用并且多阶段发生发展的疾病。大约1/3大肠癌具有遗传背景,为一组遗传易感人群,因而难以
Colorectal cancer is a common gastrointestinal cancer, the incidence of malignant tumors in the western developed countries ranked second. In our country, the incidence of colorectal cancer has been rising due to changes in eating habits and lifestyles and has risen to the 3rd to 5th place with a gradual upward trend. Early symptoms of colorectal cancer is not obvious, and the slow progression of the disease, found mostly late. Therefore, early diagnosis and early treatment is an important research direction of prevention and treatment. Colorectal cancer is a multi-factor, internal and external interaction and multi-stage development of the disease. Approximately one third of colorectal cancers have a genetic background that is difficult for a group of genetically predisposed individuals