Number stages of anal cancer

The number staging system uses the TNM system to divide cancers into stages. Most types of cancer have 4 stages, numbered from 1 to 4.

Anal intraepithelial neoplasia (AIN)

Anal intraepithelial neoplasia means there are abnormal cells within the lining of the anus.

Stage 1 anal cancer means that the cancer is less than 2cm in size and hasn't spread to any nearby tissue, lymph nodes or other organs.

Stage 2 anal cancer is bigger than 2 cm. It hasn't spread to any nearby tissue, lymph nodes or other organs.

Stage 3 anal cancer has spread to nearby tissue or lymph nodes. It hasn't spread to distant body parts.

Stage 4 anal cancer means the cancer has spread to other parts of the body, such as the liver. It is also called advanced anal cancer.

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