Digoxin and other cardiac glycosides inhibit block tumor growth. - Zhang,H.F.; Qian,D.Z.; Tan,Y.S.; Lee,K.A.; Gao,P.; Ren,Y.R.; Rey,S.; Hammers,H.; Chang,D.; Pili,R.; Dang,C.V.; Liu,J.O.; et al. (PNAS, 2008)