Sphingosine kinase (SphK) is an oncogenic lipid kinase and a key regulator of the sphingolipid metabolic pathway. The SphK isoforms (SphK1 and SphK2) catalyze the conversion of the pro-apoptotic substrate D-erythro-sphingosine (Sph) to the pro-growth/survival product sphingosine-1-phosphate (S1P). In addition, over-expression of SphK1/SphK2, have been associated with oncogenic transformation...