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anal cancer
Anal cancer is a cancer (malignant tumor) which arises from the anus, the distal opening of the gastrointestinal tract. It is a distinct entity from the more common colorectal cancer.
Anal cancer is typically an anal squamous cell carcinoma that arises near the squamocolumnar junction, often linked to human papillomavirus (HPV) infection. It may be keratinizing (basaloid) or non-keratinizing (cloacogenic). Other types of anal cancer are adenocarcinoma, lymphoma, sarcoma or melanoma. From data collected 2004-2010, the relative five year survival rate in the United States is 65.5%, though individual rates may vary depending upon the stage of cancer at diagnosis and the response to treatment.〔(【引用サイトリンク】url=http://seer.cancer.gov/statfacts/html/anus.html )〕
==Signs and symptoms==
Symptoms of anal cancer can include pain or pressure in the anus or rectum, a change in bowel habits, a lump near the anus, rectal bleeding, itching or discharge. Bleeding may be severe.〔National Cancer Institute. (Anal Cancer Treatment (PDQ) Patient Version. ) 13 June 2008. Accessed 26 June 2009.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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