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Four-year clinical update from the American Society of Breast Surgeons MammoSite brachytherapy trial
The American Journal of Surgery, 06/25/09

Nelson JC et al. – Study reports that the locoregional control, complications, and cosmetic outcomes from MammoSite partial breast irradiation (APBI) at the 4-year update are acceptable and similar to results seen with other forms of APBI.

Methods

A 4-year update on the efficacy, cosmetic results, and complications of MammoSite breast brachytherapy in pts enrolled in the American Society of Breast Surgeons registry trial is presented
1,449 breasts in 1,440 pts with early stage BCa undergoing breast-conserving therapy
Pts were treated with adjuvant APBI (34 Gy in 3.4-Gy fractions) delivered with the MammoSite device
Median follow-up period for the entire group was 36.1 months

Results

3-yr actuarial rate of ipsilateral breast tumor recurrence was 2.15%
3-yr actuarial rate of axillary recurrence was 0.36%
Complication rates were: infection, 9.5%; seroma, 26.8%, symptomatic seroma, 12.7%; and fat necrosis, 2.0%
Percentages of breasts with good or excellent cosmetic results were: 12 mo, 95%; 24 mo, 94%; 36 mo, 94%; and 48 mo, 91%

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