PARP1 and cervical cancer: Lupeol is a lupane-type pentacyclic triterpene found in many foods of vegetal origin and which exhibits selective antitumor properties; Prasad et al. investigated the effects exerted by lupeol in HeLa cervical cancer cells and reported its inhibitory activity on cell proliferation and viability by inducing S-phase cell cycle arrest and apoptosis through increased expressions of the apoptotic markers (cleaved PARP, Bax/Bcl2 ratio).