What is colorectal cancer, colorectal cancer , including colon and rectum cancer, colorectal cancer who have called for harm to human health is very common form of cancer, cancer in the United States and Europe accounted for the second cause of death in cent of all cancer causes of death in China in the fourth to sixth place. Jin Nianlai the rise for decades by the World country variation of digestive tract cancer, and nearly 20 years of regional dynamic changes of the incidence of cancer, can be predicted that colorectal cancer may become the 21st century, the highest incidence of malignant tumors I, therefore prevention of this disease is very important, but also medical staff of research. Pathogenesis of colorectal cancer has not yet fully understood, the current majority view that colorectal cancer is mainly dysplastic adenoma never evolved, and this is colorectal cancer in the "theory of adenoma cancer." Addition to colorectal adenoma -related, but also may be related to the following factors:
1. Chronic colonic inflammation, such as non-infectious inflammatory bowel disease (ulcerative colitis and Crohn's disease), infectious colitis, such as schistosomiasis, a chronic disease (echinococcosis and fungal disease), etc., the occurrence of colorectal cancer the control group than in the same age as high.
2. Living habits and environmental factors will affect the progress of colorectal cancer: Colorectal cancer has a distinct regional distribution, in the low incidence of high incidence of residents moved to Europe, the incidence of colorectal cancer to rise to the second generation with local residents Incidence rates were similar. Diet, living habits are the important reasons causing colon cancer, study shows: too much fat and red meat intake, smoking, long-term intoxicated alcohol, obesity and lack of physical activity may increase the incidence of colon cancer, but fruits, vegetables, fiber, Some trace elements such as calcium, vitamin D, folate can decrease the incidence of colon cancer.
What is colorectal cancer 3. Other areas such as genetics, radiation damage to the incidence of colorectal cancer have a certain relationship.