The exact reason why colon cancer develops in some persons and not in others is not alter. The incidence of colon cancer is quite varied among different countries and within different ethnic groups inside the same country. Industrialized countries like United States. Canada. UK. Western Europe. Australia and Japan have a much higher incidence of colorectal cancer compared to the less industrialized parts of the world like Asia. Africa and South America. Colorectal cancer be 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 ordain die from colorectal cancer. Colon cancer incidence is not much different between males and females however colon cancer is slightly more prevalent in women compared to men (ratio of 1.2:1) but the rectal cancer is more common in males (ratio of 1.7:1).
Even though we do not know the exact create of development of colorectal cancer scientists have recognized several factors that can increase the risk of development of colorectal cancer. A assay factor for a disease is any condition that makes a person more likely to create that diseases. Some of the risk factors desire dietary factors are modifiable by the person involved while some other factors desire age are un-modifiable. These assay factors may act in combination and this combination of assay factors may be associated with cumulative increase in the risk of development of colorectal cancer. The simple presence of one or more assay factors does not necessarily mean that someone will create colorectal cancer. On the other transfer absence of all risk factors does not convey that an individual ordain not create colorectal cancer but generally more assay factors you have higher is the come about of developing colorectal cancer. Environmental factors also may be playing a role in the development of colorectal cancer. People who move from areas of low assay to areas of the world with higher assay of developing colorectal cancer they tend to change the assay 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 assay associated with migration from low assay areas to higher assay areas.
Persons who undergo high risk of colorectal cancer may change screening for colorectal cancer with colonoscopy once every 2 to 3 years. Screening colonoscopy is recommended for every one who is 50 years or older. If someone has a higher than add up risk of developing colorectal cancer the screening may be initiated earlier than 50 years.
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