Rafael Silva Torres has completed his Ph.D. from Escuela Nacional de Ciencias Biológicas of National Polytechnic Institute an abroad studies M. Phil. from Loughborough University of Technology Great Britain and sabbatical year from Musseum National D´Histoire Naturelle Paris France. He has published more than 17 papers in reputed journals and 4 book chapters and has been serving as editorial board member of reputed journals. He has been director of more than 50 Bsc. Tesis and was participated in more than 150 national and international congresses. He is membership of National Association of Pharmaceutical Sciences and American Chemical Society. He is investigating the properties antitumor of medicinal plants and fruits suchs as: Sedumpraealtum DC, Annonamuricata,Opuntia joconostle, and Stenocereusgriseus H.