AR and breast cancer: The authors found, that all cancer cells were inhibited in growth irrespective of their PR status, as there are: MCF-7 breast cancer cells carrying PR, MDA-MB- 231 breast cancer cells with no PR expression, PR negative and androgen receptor positive LNCaP prostate cancer cells, and PR negative androgen receptor positive PC3 prostate cancer cells are all inhibited by mifepristone with similar potency [69].