1. Laboratory of Pharmacology (F.B., A.P., M.G., C.P., A.B., T.F.), Department of Oncology, Biology and Genetics, University of Genova, 16132 Genova, Italy
2. Istituto Zooprofilattico Sperimentale del Piemonte (A.F.), Liguria e Valle D'Aosta, National Reference Center of Veterinary and Comparative Oncology, 16132 Genova, Italy
3. IPSEN (M.D.C.), Milford, Massachusetts 01757