Stage II Anal Cancer
Stage II anal cancer was formerly treated with abdominoperineal resection. Current sphincter-sparing therapies include wide local excision for small tumors of the perianal skin or anal margin, or definitive chemoradiation (fluorouracil and mitomycin) for cancers of the anal canal. Salvage chemotherapy (fluorouracil with cisplatin plus a radiation boost) may avoid permanent colostomy in patients with residual tumor following initial nonoperative therapy. Radical resection is reserved for patients with incomplete responses or recurrent disease. Therefore, continued surveillance with rectal examination every 3 months for the first 2 years and endoscopy/biopsy when indicated after completion of sphincter-preserving therapy is important.
Standard treatment options:
- Small tumors of the perianal skin or anal margin not involving the anal sphincter may be adequately treated with local resection.
- All other stage II cancers of the anal canal that involve the anal sphincter or are too large for complete local excision are treated with external-beam radiation therapy plus chemotherapy as was shown in the RTOG-8314 trial, for example.[2-8]
Chemotherapy with fluorouracil and mitomycin combined with primary radiation therapy appears to be more effective than radiation therapy alone. The optimal dose of radiation with concurrent chemotherapy was studied, as seen in the RTOG-9811 and RTOG-9208 trials, for example.[10,11]
- Radical resection is reserved for continued residual or recurrent cancer in the anal canal after nonoperative therapy.
- Alternately, salvage chemotherapy with fluorouracil and cisplatin combined with a radiation boost may avoid a permanent colostomy in selected patients with small amounts of residual tumor following initial nonoperative therapy.
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with stage II anal cancer. The list of clinical trials can be further narrowed by location, drug, intervention, and other criteria.
General information about clinical trials is also available from the NCI Web site.References
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- Flam M, John M, Pajak TF, et al.: Role of mitomycin in combination with fluorouracil and radiotherapy, and of salvage chemoradiation in the definitive nonsurgical treatment of epidermoid carcinoma of the anal canal: results of a phase III randomized intergroup study. J Clin Oncol 14 (9): 2527-39, 1996. [PUBMED Abstract]
- Epidermoid anal cancer: results from the UKCCCR randomised trial of radiotherapy alone versus radiotherapy, 5-fluorouracil, and mitomycin. UKCCCR Anal Cancer Trial Working Party. UK Co-ordinating Committee on Cancer Research. Lancet 348 (9034): 1049-54, 1996. [PUBMED Abstract]
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- Sandhu AP, Symonds RP, Robertson AG, et al.: Interstitial iridium-192 implantation combined with external radiotherapy in anal cancer: ten years experience. Int J Radiat Oncol Biol Phys 40 (3): 575-81, 1998. [PUBMED Abstract]