human 50 human cell priority journal breast cancer 42 controlled study 40 Breast Neoplasms 34 article 34 Female 30 female 26 Humans 22 nonhuman 18 Animals 16 Human 16 Mice 16 animal experiment 16 mouse 16 protein expression 16 animal cell 14 animal model 14 cancer cell 14 Breast cancer 12 Mice, Inbred BALB C 12 Support, Non-U.S. Gov't 12 cancer cell culture 12 cell proliferation 12 in vitro study 12 Cells, Cultured 10 Tumor Cells, Cultured 10 progesterone receptor 10 unclassified drug 10