breast cancer 74 human 67 controlled study 54 article 53 priority journal 52 nonhuman 51 Female 46 Humans 46 human cell 43 female 42 Animals 39 Breast Neoplasms 39 mouse 37 Mice 34 animal cell 30 unclassified drug 30 protein expression 29 animal model 26 animal experiment 25 cell proliferation 25 Mice, Inbred BALB C 24 metabolism 23 Mammary Neoplasms, Experimental 18 animal tissue 18 progesterone receptor 18 Article 17 Cell Line, Tumor 17 cancer cell 17 Breast cancer 16 Cell Proliferation 16