An alkylphospholipid that induces apoptotic cell death in a time- and dose-dependent manner in a variety of tumor cell lines but not in normal vascular endothelial cells; causes inhibition of PC-3 prostate carcinoma cell growth (GI50 = 5 µM at 24h) associated with rapidly decreased Akt activation; induces p21WAF1 expression in squamous carcinoma cells, leading to loss in cyclin-dependent kinase activity and cell cycle arrest.