Anal Cancer

See also : Human Papillomavirus
Anal cancer is a type of cancer which arises from the anus, the distal orifice of the gastrointestinal tract. It is a distinct entity from the more common Colorectal Cancer. The etiology, risk factors, clinical progression, staging, and treatment are all different. Anal cancer is typically a squamous cell carcinoma that arises near the squamocolumnar junction. It may be keratinizing (basaloid) or non-keratinizing (cloacogenic). Other types of anal carcinoma are adenocarcinoma, lymphoma, sarcoma or melanoma. An estimated 90% (27,400) were attributable to Human Papillomavirus (HPV).

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