nonhuman breast cancer 88 mouse 78 Animals 77 article 70 Mice 68 priority journal 68 human 67 Female 65 controlled study 63 female 63 animal cell 62 Humans 56 animal model 54 animal experiment 52 Mice, Inbred BALB C 50 protein expression 47 animal tissue 38 cell proliferation 37 unclassified drug 37 Breast Neoplasms 35 Mammary Neoplasms, Experimental 34 progesterone receptor 34 human cell 33 Receptors, Progesterone 31 animal 31 metabolism 31 cancer growth 27 tumor growth 26 Cell Line, Tumor 25