article human breast cancer 72 human cell 62 controlled study 58 Female 54 Breast Neoplasms 50 Humans 50 female 44 priority journal 44 nonhuman 34 Animals 32 Mice 32 cell proliferation 30 mouse 28 protein expression 28 cancer cell culture 26 unclassified drug 26 animal experiment 22 animal model 22 Cell Proliferation 20 Cell Line, Tumor 18 Mice, Inbred BALB C 18 animal cell 18 Breast cancer 16 Human 16 Tumor Cells, Cultured 16 in vitro study 16 progesterone receptor 16 Cells, Cultured 14