human 59 human cell Article 57 controlled study 53 Humans 44 metabolism 34 unclassified drug 33 male 21 protein expression 21 female 20 enzyme linked immunosorbent assay 19 in vitro study 19 nonhuman 19 genetics 17 chemistry 16 adult 15 human tissue 15 Male 14 cell proliferation 14 pathology 14 Animals 13 animal 13 apoptosis 13 Western blotting 12 drug effect 12 major clinical study 12 Cell Line, Tumor 11 Female 11 animal experiment 10 cell viability 10