5 doctors weighed in:

What is a proper margin for a lumpectomy?

5 doctors weighed in
Dr. Greg Pahnke
Surgery - Oncology
3 doctors agree

In brief: Is it cancer orDCIS

For the usual cancer i look for a 3mm margin if a unifocal cancer without satellites on MRI or extensive dcis around the primary cancer but dcis is a different story i look for 10mm margin if possible if 1 comedo changes(high grade with central-comedo necrosis)-which can involve juxtaopposed ducts and 2 with cribiform/ micropapillary type that can extend out a long way as a single duct.

In brief: Is it cancer orDCIS

For the usual cancer i look for a 3mm margin if a unifocal cancer without satellites on MRI or extensive dcis around the primary cancer but dcis is a different story i look for 10mm margin if possible if 1 comedo changes(high grade with central-comedo necrosis)-which can involve juxtaopposed ducts and 2 with cribiform/ micropapillary type that can extend out a long way as a single duct.
Dr. Greg Pahnke
Dr. Greg Pahnke
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Dr. Sean Canale
Breast Surgery

In brief: Controversial

Most all agree that 2mm or more is sufficient especially when following with xrt.
1-2mm is probably ok with an XRT boost. <1mm begins to be uncomfortable although some studies define clear/negative as "no tumor on ink". Then there are proponents of saying margins >10mm for somedcis may not need xrt. The issue is being comfortable with what may or not be on the other side of the margin.

In brief: Controversial

Most all agree that 2mm or more is sufficient especially when following with xrt.
1-2mm is probably ok with an XRT boost. <1mm begins to be uncomfortable although some studies define clear/negative as "no tumor on ink". Then there are proponents of saying margins >10mm for somedcis may not need xrt. The issue is being comfortable with what may or not be on the other side of the margin.
Dr. Sean Canale
Dr. Sean Canale
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