In vitro and in vivo antitumor activity of a novel immunomodulatory drug, leflunomide: mechanisms of action. - Xu,X.; Shen,J.; Mall,J.W.; Myers,J.A.; Huang,W.; Blinder,L.; Saclarides,T.J.; Williams,J.W.; Chong,A.S. (Biochem Pharmacol, 1999)