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Localised anal cancer is squamous cell cancer of the anal canal that has not spread beyond the pelvis and groin, one of the few cancers cured mainly by chemotherapy and radiotherapy together rather than by surgery. Fluorouracil with mitomycin during radiotherapy has been standard since the ACT II trial; surgery to remove the anus is kept for the minority whose cancer persists or returns.
Anal squamous cell carcinoma confined to the anal canal, the pelvic nodes and the groin nodes is treated to keep the anus. Before 1974 the standard was abdominoperineal resection with a permanent colostomy; Norman Nigro then showed that fluorouracil and mitomycin given during radiotherapy made most tumours disappear, and the UKCCCR ACT I and EORTC trials in the 1990s proved chemoradiotherapy beat radiotherapy alone. ACT II (Lancet Oncology 2013), the largest anal cancer trial with 940 patients, found that cisplatin was no better than mitomycin alongside fluorouracil and radiotherapy, that maintenance chemotherapy added nothing, and that tumours keep regressing for months, so response should be judged at 26 weeks rather than 11 before anyone is sent for surgery. RTOG 98-11 had likewise found induction cisplatin inferior to mitomycin-based treatment.
Today's treatment is intensity-modulated radiotherapy with concurrent fluorouracil (or capecitabine) and mitomycin, with the dose scaled to stage; very small well-differentiated perianal tumours can be excised alone. Salvage abdominoperineal resection is offered when biopsy confirms persistent or recurrent disease. HPV or p16 status is favourable and HIV is no longer a bar to full-dose treatment when CD4 counts are adequate. The UK PLATO programme (ACT3, ACT4 and ACT5) is testing lower doses for early tumours and higher doses for locally advanced ones, EA2165 tests nivolumab after chemoradiotherapy for high-risk disease, and circulating HPV DNA is being studied as a way to tell early who is cured.
The large majority of anal cancers are diagnosed without distant spread, and most are cured without losing the anus.
Right-sided tumours behave differently from left-sided and rectal ones; the colon drains along its mesenteric vessels, the rectum into the mesorectum and pelvic side wall.
Same organ: Colon cancer (adenocarcinoma of the colon), Micropapillary adenocarcinoma of the colon and rectum, Adenoma-like adenocarcinoma of the colon and rectum, Lynch syndrome-associated colorectal cancer, Familial adenomatous polyposis-associated colorectal cancer, Mucinous adenocarcinoma of the colon and rectum, Signet ring cell carcinoma of the colon and rectum, Medullary carcinoma of the colon, Serrated adenocarcinoma of the colon and rectum, Peritoneal mesothelioma, Colorectal cancer, Rectal cancer, Mismatch-repair deficient (MSI-high) colorectal cancer, BRAF V600E-mutant colorectal cancer, HER2-amplified colorectal cancer, KRAS G12C-mutant colorectal cancer, Early-onset colorectal cancer (under 50), Anal cancer (squamous cell carcinoma), Appendiceal cancer and pseudomyxoma peritonei, Small intestine cancer (small bowel adenocarcinoma), Small intestinal neuroendocrine tumours, Anal high-grade squamous intraepithelial lesions (precursor), Metastatic and recurrent anal squamous cell carcinoma, Low-grade appendiceal mucinous neoplasm and pseudomyxoma peritonei, Appendiceal adenocarcinoma (mucinous and non-mucinous, including signet ring cell), Goblet cell adenocarcinoma of the appendix, Localised small bowel adenocarcinoma (stage I to III, resected), Advanced and metastatic small bowel adenocarcinoma
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Also on OnCo: Symptoms and red flags · Early detection roadmap.
Pelvic MRI, PET-CT, examination of the groins, HIV testing and HPV or p16 status; biopsy of suspicious groin nodes.
Intensity-modulated radiotherapy with concurrent fluorouracil (or capecitabine) and mitomycin, dose scaled to stage (ACT II, RTOG 98-11); small perianal tumours may be excised alone.
Clinical assessment at 26 weeks; biopsy only if disease persists or grows, because regression continues for months (ACT II).
Salvage abdominoperineal resection with permanent colostomy; inguinal node dissection or radiotherapy for isolated groin recurrence.
Trials of dose escalation (PLATO ACT5) and adjuvant nivolumab (EA2165); standard care remains chemoradiotherapy alone.
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Most decisions on the localised and metastatic anal cancer pages, from the chemoradiotherapy schedule to when to operate and what to give for metastatic disease, follow this guideline or its American counterpart.
Fluorouracil and mitomycin with radiotherapy remains the standard for localised anal cancer, without maintenance, and patients whose tumour has not vanished at three months should be watched to six months rather than sent straight to surgery.
Query for this cancer: (TITLE:"Localised anal squamous cell carcinoma" OR ABSTRACT:"Localised anal squamous cell carcinoma" OR TITLE:"stage I to III" OR ABSTRACT:"stage I to III" OR TITLE:"Non-metastatic anal cancer" OR ABSTRACT:"Non-metastatic anal cancer" OR TITLE:"Locoregional anal squamous cell carcinoma" OR ABSTRACT:"Locoregional anal squamous cell carcinoma" OR TITLE:"Anal canal cancer treated with chemoradiotherapy" OR ABSTRACT:"Anal canal cancer treated with chemoradiotherapy" OR TITLE:"Stage I to III anal cancer" OR ABSTRACT:"Stage I to III anal cancer") AND (treatment OR therapy OR trial OR survival OR diagnosis). Results are unfiltered search hits about Localised anal squamous cell carcinoma (stage I to III), not a curated reading list.
The targets of this cancer's medicines and the ones linked to it directly.
Cases by country, the UK and NHS pathway and other country lenses, the expert centres with trials on record, and the centres named on this cancer's subtypes.
One section per setting: the options named, what each is for, the trials behind them, the recorded trade-offs and the questions to ask.
Bleeding that does not stop by itself, bleeding from more than one site, or new bruising in several places or one large area.
Persistent headache with extreme tiredness, nausea, dizziness on standing or low blood pressure. Vomiting, severe weakness or collapse is adrenal crisis.
Capecitabine: take within 30 minutes after a meal. DPD deficiency (DPYD variants) causes severe toxicity: pre-treatment genotyping is recommended in Europe.
Capecitabine: reduce to 75% for CrCl 30-50; contraindicated below 30.
Immunotherapy can attack hormone-producing glands: most often the thyroid (usually ending in an under-active thyroid needing lifelong tablets), and less often the pituitary (hypophysitis) or adrenal glands, which can be life-threatening if missed.
See all on the product pages:Fluorouracil (5-FU)Mitomycin CNivolumab·Printable cards in the navigator
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