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Local excision of rectal cancer by transanal endoscopic microsurgery (TEM) combined with radiotherapy: new concept of therapeutic approach.

Transanal endoscopic microsurgery (TEM), associated with preoperative radiotherapy in selected groups, allows minimally invasive full thickness local excision of rectal tumors with perirectal fat dissection. In our experience, 95 patients with extraperitoneal rectal carcinoma underwent TEM resection for T1 (21 cases), T2 (48 cases) and T3 (15 cases) lesions. In eleven patients the pathologist did not find cancer cells in the specimen (pT0) after full dose of radiotherapy and TEM. The postoperative results were as follows: 11 minor complications (11.6%), 7 leaking sutures, 3 stool incontinence and 1 rectal haemorrhage, that resolved with medical therapy and two major complications (2.1%), one rectovaginal fistula that required reoperation and one rectourethral fistula treated by conservative therapy. No perioperative mortality was observed. Mean follow up was 40 months (range 2-96 months) with 7 (7.4%) local recurrences. Of those, 5 patients were successfully retreated and 2 high risk patients underwent postoperative radiotherapy. The overall survival in T0 and T1 patients was 100%. The overall survival in T2 and T3 patients was 81% and 62.1% respectively. This study reports the application of TEM combined with radiotherapy in the treatment of rectal cancer in selected patients. This approach is feasible, safe, and appears to be effective at the present follow up, with preservation of normal sphincter function.

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