[1] Univ Alabama Birmingham, Birmingham, AL USA
[2] G Ronzoni Inst Chem & Biochem Res, Milan, Italy
[3] Sigma Tau Ind Farmaceut Riunite SpA, Pomezia, Italy
[4] Sigma Tau Res Switzerland SA, Milan, Italy
[5] Fdn IRCCS Ist Nazl Tumori, Milan, Italy
[6] Technion Israel Inst Technol, Bruce Rappaport Fac Med, Canc & Vasc Biol Res Ctr, IL-31096 Haifa, Israel