Colorectal cancer represent over 9 percent of all cancers in men and about 10 percent of all cancers in women world-wide. In industrialized countries the incidence of colorectal cancer can be as high as 12 to 14 of all cancers, and in non-industrialized countries much lower rates of about 7 to 8 percent of all cancers diagnosed may be colorectal cancer.
Excluding skin cancer, colorectal cancer is the third commonest cancer diagnosed in the United States. Each year over 100,000 Americans are diagnosed with colon cancer and over 50 percent of these patients will die from colorectal cancer. Even though we do not know the exact cause of development of colorectal cancer, scientists have recognized several factors that can increase the risk of development of colorectal cancer. The simple presence of one or more risk factors does not necessarily mean that someone will develop colorectal cancer. On the other hand absence of all risk factors does not mean that an individual will not develop colorectal cancer, but generally more risk factors you have higher is the chance of developing colorectal cancer. Environmental factors also may be playing a role in the development of colorectal cancer. People who migrate from areas of low risk to areas of the world with higher risk of developing colorectal cancer, they tend to acquire the risk of the country to which they are migrating. This finding suggests the presence of environmental factors causing higher risk of developing colorectal cancer. Changes in dietary factors associated with migration may also be contributing to this increase in risk associated with migration from low risk areas to higher risk areas. fenben for cancer
