Medical expert of the article
New publications
Anorectal cancer
Last reviewed: 05.07.2025
All iLive content is medically reviewed or fact checked to ensure as much factual accuracy as possible.
We have strict sourcing guidelines and only link to reputable media sites, academic research institutions and, whenever possible, medically peer reviewed studies. Note that the numbers in parentheses ([1], [2], etc.) are clickable links to these studies.
If you feel that any of our content is inaccurate, out-of-date, or otherwise questionable, please select it and press Ctrl + Enter.
Most often, anorectal cancer is represented by adenocarcinoma. Squamous cell (nonkeratinizing epithelial or basal cell) carcinoma of the anorectal zone accounts for 3-5% of cancerous lesions of the distal colon.
Less common are basal cell carcinoma, Bowen's disease (intradermal carcinoma), extramammary Paget's disease, cloacogenic carcinoma, and malignant melanoma. Other tumors include lymphoma and various forms of sarcoma. Metastasis occurs via the lymphatic pathways of the rectum and to the inguinal lymph nodes.
[ What causes anorectal cancer?
Risk factors include human papillomavirus (HPV) infection, chronic fistulas, anal skin irradiation, leukoplakia, lymphogranuloma venereum, and genital warts. Homosexual men who engage in anal intercourse are at increased risk. Patients with HPV infection may have dysplasia in mildly abnormal or apparently normal anal epithelium ("anal intraepithelial neoplasia," histologic type I, II, or III). These changes are more common in HIV-infected patients, especially homosexual men. At higher grades, progression to invasive carcinoma occurs. It is unknown whether early recognition and eradication of infection improve long-term outcome; therefore, screening recommendations are uncertain.
Where does it hurt?
What do need to examine?
How to examine?
Who to contact?
Treatment of anorectal cancer
Wide local excision is often satisfactory for perianal carcinoma. Combined radiation and chemotherapy result in a high cure rate for squamous cell anal and cloacogenic tumors. If radiation and chemotherapy do not result in complete tumor regression and there is no metastasis outside the irradiated area, abdominoperineal resection is indicated.
More information of the treatment