Anal cancer is a type of cancer in which malignant (cancer) cells form in the tissues of the anus. The anus is at the end of the large intestine, below the rectum. It is through anus that stool (solid waste) leaves the body. The skin around the outside of the anus is called the perianal area. Tumours in this area are skin tumours, not anal cancer.
Being infected with the human papillomavirus (HPV) can affect the risk of developing anal cancer. The exact reason behind anal cancer is not known, but a significant research so far has found its connection with HPV and more research is being done to learn how HPV might cause anal cancer. Over the years, it has been found that HPV causes many anal squamous cell carcinomas, however, the role of this virus in causing anal adenocarcinomas is less certain.
The risk factors that increase the risk of anal cancer are as follows.
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