<prompt> Treatment of squamous cell carcinoma of anal canal is?Cisplatin based chemotherapy followed by radical radiotherapyAbdominoperineal resectionRadical radiotherapyRadical radiotherapy followed by mitomycin-c based chemotherapy  <response>: Cancers of the anal canal can be divided into those affecting the anal margins distal to the dentate line and those affecting the anal canal proximal to the dentate line. Treatment of the anal epidermoid or squamous cell carcinoma Ca of anal margin is treated in similar way to the squamous cell carcinoma of the skin and other locations because adequate surgical margins can usually be achieved without resecting the anal sphincter Wide local excision is adequate. Epidermoid cancer occurring in the anal canal cannot be excised locally without destroying the sphincter so the first line therapy is Chemoradiotherapy nigro protocol More than 80 are cured by chemoradiation. If any residual tumor is left behind after chemoradiation or recurrence occurs an APR is performed Also know Chemotherapy used is combination of 5 FU and mitomycin C. Ref: Bailey Love 25e, page 1269; Schwaz 9e, Page 1053. 