Survey of American and Canadian general surgeons' perceptions of margin status and practice patterns for breast conserving surgery.

Although breast conservation surgery (BCS) is commonly performed, several aspects of the procedure remain controversial. We undertook a cross-sectional survey to compare Canadian (CDN) and American (AM) general surgeons' reported BCS practice patterns to better understand the cross-border differences in early-stage breast cancer surgery care. A modified Dillman Method survey was mailed to 1,447 AM and 1,443 CDN surgeons. Factors evaluated included preoperative assessment, margin definition, surgical techniques, and re-excision practices. The response rate was 26% and 51% for AM and CDN surgeons, respectively. There was variation in use of preoperative core biopsies. American surgeons required wider margins for invasive cancer and ductal carcinoma in situ, and more often recommend re-excision for invasive cancer with 1 and 2mm margins (p<0.05). There was also variability in surgical techniques used for intraoperative margin assessment. Wide variation in BCS practice was observed, with some of this variability related to surgeon country.