The selective cytotoxicity elicited by phytochemical extract from Senecio graveolens (Asteraceae) on breast cancer cells is enhanced by hypoxia - Echiburú-Chau, C; Alfaro-Lira, S; Brown, N; Salas, C O; Cuellar, M; Santander, J; Ogalde, J P; Rothhammer, F (Int J Oncol, 2014)