priority journal unclassified drug controlled study 40 nonhuman 36 Animals 32 cell survival 32 article 30 Cell Survival 28 animal cell 28 human 28 human cell 26 Humans 22 cell death 18 protein expression 18 Article 16 Mice 16 cell viability 16 metabolism 16 mouse 16 animal experiment 14 apoptosis 14 cytotoxicity 14 female 14 Apoptosis 12 Cell Line, Tumor 12 Photosensitizing Agents 12 animal 12 enzyme activity 12 Photochemotherapy 10 animal model 10