Because of the suffering and frequent appearance of many of the harmful side effects of different toxicity resulting from the use of industrial products manufactured in the lab or treatments, researchers have tended to look for an alternative which is natural products derived from medicinal plants and non-medical scattered in different parts of the earth. As in southwest Saudi Arabia Faifa Mountains region characterized by the rich nature contains many types' medical plants. It has raised interest in what that region owned the possibility to contain some of extracts that may have a positive role in the fight against cancer cells. Depends on that, this thesis is aimed to investigate and assessment the anti-cancer activity of some plants (Withania somnifera, Adenium obesum and Datura innoxia) in vitro...