Anal cancer

Any cancer that starts in the anus or the skin around the anus is called anal cancer. This cancer is formed by abnormal cells that grow and divide without stopping. The cancer cells replace normal cells and form a tumor or lump. As a tumor gets bigger, it can grow into nearby tissues and organs. Cancer cells can spread to other parts of the body through the blood or lymph vessels. Most anal cancers start in the cells that line the inside of the anus. Tumor cells grow there, invade through the layers of the anus, and spread to lymph nodes and other tissues.
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