[1] Univ Lisbon, Sch Med, Inst Mol Med, Canc Biol Unit, P-1699 Lisbon, Portugal
[2] Harvard Univ, Sch Med, Dana Farber Canc Inst, Dept Med Oncol, Boston, MA 02115 USA
[3] Harvard Univ, Beth Israel Deaconess Med Ctr, Sch Med, Dept Hematol Oncol & Canc Biol, Boston, MA 02215 USA
[4] Indiana Univ, Sch Med, Dept Med, Simon Canc Ctr, Indianapolis, IN USA