human human cell in vitro study controlled study 172 Humans 147 article 125 priority journal 120 nonhuman 94 unclassified drug 89 Animals 79 Article 78 female 72 metabolism 72 protein expression 67 in vivo study 64 male 63 Female 60 mouse 58 animal experiment 55 animal cell 54 Mice 53 animal model 49 Cell Line, Tumor 47 apoptosis 44 cell proliferation 41 Male 39 animal 37 drug effects 32 Cell Proliferation 31 cell culture 31