Drug Synergism article 30 nonhuman 28 Animals 26 drug potentiation 26 priority journal 24 controlled study 22 drug effect 20 human 18 Humans 16 Female 12 animal 12 physiology 12 unclassified drug 12 Mice 10 Rats 10 dose response 10 in vitro study 10 rat 10 Cell Survival 8 Estradiol 8 Synergism 8 animal experiment 8 animal tissue 8 apoptosis 8 cell proliferation 8 concentration response 8 drug effects 8 estradiol 8 female 8