IC 50 article 13 human 11 plant extract 9 unclassified drug 9 cytotoxicity 8 human cell 8 Inhibitory Concentration 50 5 antioxidant 5 controlled study 5 Humans 4 antineoplastic agent 4 antioxidant activity 4 medicinal plant 4 nonhuman 4 plant leaf 4 Antineoplastic Agents, Phytogenic 3 Cytotoxicity 3 Molecular Structure 3 Plant Extracts 3 Plant Stems 3 antibacterial activity 3 antiinfective agent 3 antineoplastic activity 3 breast cancer 3 cancer cell culture 3 chemistry 3 drug activity 3 drug effect 3 drug isolation 3