Animals 31 animal 31 human 29 mouse 27 Article 26 Humans 26 nonhuman 24 controlled study 23 animal experiment 22 metabolism 22 female 21 animal model 20 Mice 19 genetics 19 human cell 17 pathology 17 tumor xenograft 17 Female 16 Xenograft Model Antitumor Assays 16 drug screening 16 Cell Line, Tumor 15 in vivo study 15 tumor cell line 15 xenograft 14 in vitro study 13 animal tissue 12 cell proliferation 12 animal cell 11 apoptosis 10 gene expression 10