Substances in legumes and soybeans (soyasaponins) were shown to induce cell death (apoptosis) in an aggressive Cervical Cancer cell line (Hela).  
Xiao JX, et al. Toxicol In Vitro. 2007 Aug;21(5):820-6. Epub 2007 Feb 9. Morphological study on apoptosis Hela cells induced by soyasaponins.
 
Xiao JX, et al. Exp Toxicol Pathol. 2007 Sep;59(1):35-42. Epub 2007 Jun 20. Soyasaponins inhibit the proliferation of Hela cells by inducing apoptosis.