The problem with a chemo patient lactating is that the lactocytes (the 
cells that actually make the milk) are likely adversely affected by the 
chemotherapy drugs, because their metabolic rate is very high. That's 
how chemo drugs kill the cancer without killing the patient, they are 
more toxic to tissues that are most metabolically active. Other highly 
metabolic tissues like hair follicles, erythropoetic tissue of the bone 
marrow, and intestinal mucosa are injured, hence the infamous side 
effects of chemo. In other words, she might or might not be able to 
maintain a milk supply during chemo.
Please do let us know how she does, and if this turns out to be a problem.
Catherine Watson Genna, IBCLC NYC

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