It is certainly possible that the lumpectomy damaged the milk ducts or 
nerves. There could be scarring as well. If she received radiation after 
the surgery that also could affect milk production. While I am not a doctor 
or an expert on cancer and I hate to alarm her, I hope she seeks thorough 
testing for a recurrence of the breast cancer. I recently had someone leave 
a comment on my article about what to do when one side produces more milk 
than the other. She said the difference in production turned out to be 
attributable to stage 0 breast cancer. The pathology report showed that her 
milk ducts were completely filled with cancer cells:
http://www.breastfeeding123.com/what-do-i-do-when-one-side-produces-more-mom-to-mom-3/

For information on breastfeeding after breast cancer treatment such as 
chemotherapy, radiation, lumpectomy and mastectomy, see:
http://www.breastfeeding123.com/breastfeeding-after-breast-cancer-treatment/

For information on the safety of tests to diagnose breast cancer in a 
lactating breast, see:
http://www.breastfeeding123.com/x-rays-and-mammograms-for-lactating-women/

For an inspirational story on breastfeeding on one side with full supply 
after breast cancer surgery, see:
http://www.breastfeeding123.com/one-sided-nursing-with-full-supply/

I hope this helps.
Angela White, LLL co-leader of Rochester, MI group
http://breastfeeding123.com

             ***********************************************

To temporarily stop your subscription: set lactnet nomail
To start it again: set lactnet mail (or digest)
To unsubscribe: unsubscribe lactnet
All commands go to [log in to unmask]

The LACTNET email list is powered by LISTSERV (R).
There is only one LISTSERV. To learn more, visit:
http://www.lsoft.com/LISTSERV-powered.html