Animals 26 Humans 26 Xenograft Model Antitumor Assays human 26 mouse 26 Mice 24 controlled study 24 nonhuman 24 animal model 22 animal experiment 20 cell proliferation 20 drug screening 20 animal 18 animal cell 18 human cell 18 Mice, Nude 16 apoptosis 16 metabolism 16 Cell Line, Tumor 14 Gene Expression Regulation, Neoplastic 14 article 14 genetics 14 in vivo study 14 male 14 pathology 14 priority journal 14 protein expression 14 Apoptosis 12 Cell Proliferation 12 Neovascularization, Pathologic 12