cancer cell controlled study 52 human 50 article 44 human cell 44 Humans 40 priority journal 40 nonhuman 38 protein expression 38 Animals 36 breast cancer 32 mouse 30 Female 28 cell proliferation 28 Mice 26 animal experiment 26 Cell Line, Tumor 24 animal cell 24 animal model 24 unclassified drug 22 Breast Neoplasms 20 cancer growth 20 female 20 animal tissue 18 Article 16 Male 16 Mice, Inbred BALB C 16 Receptors, Progesterone 16 protein phosphorylation 16 Breast cancer 14