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Background  Because of its minimally invasive and highly accurate nature, the use of Mammotome, a vacuum-assisted breast biopsy device has proven beneficial to the treatment of benign breast lesions. Taking advantage of endoscopic and Mammotome techniques together, we utilized the Mammotome device for therapeutic excision of malignant lesions in breast-conserving surgery (BCS).    Methods  Between December 2009 and January 2010, two patients with early breast cancer received Mammotome-assisted endoscopic BCSs. Under ultrasound monitoring, the Mammotome system dissected the surrounding tissue and freed the tumor  en bloc  leaving negative margins; endoscopic axillary lymph node dissection then followed.    Results  The operation time was less than 180 minutes and the mean blood loss was 60 ml. The post-operative pathology report confirmed two patients to have invasive ductal carcinoma, one without axillary lymph nodes metastasis (0/11) and the other with one lymph node metastasis (1/21). No adverse events were noted. During a mean follow-up of 26.5 months, no evidence of recurrence or metastasis was found. The patients were satisfied with the cosmetic results.    Conclusions  Mammotome-assisted endoscopic surgery appears to be a valuable option for early breast cancer. The long-term therapeutic effect remains to be confirmed.

Mammotome-assisted endoscopic breast-conserving surgery: a novel technique for early-stage breast cancer