[1] European Inst Oncol, Dept Expt Oncol, I-20139 Milan, Italy
[2] Fdn Ist FIRC Oncol Mol IFOM, I-20139 Milan, Italy
[3] Univ Navarra, Dept Genet, Div Oncol, Ctr Appl Med Res, E-31008 Pamplona, Spain
[4] Hosp Basurto, Dept Hematol, Bilbao 48013, Spain