Megestrol is a man-made
progestin similar to the hormone
progesterone. Experts do not completely understand how
megestrol works. But most believe that it interferes with receptors that help
breast cancer grow and spread.
Stebbing J, Ngan S (2010). Breast cancer (metastatic), search date June 2009. Online version of BMJ Clinical Evidence: http://www.clinicalevidence.com.
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