[1] Dana Farber Canc Inst, Dept Canc Biol, Boston, MA 02215 USA
[2] Univ Paris 11, Dept Cancerol Enfant & Adolescent, Villejuif, France
[3] Univ Paris 11, CNRS, Unite Mixte Rech 8203, Villejuif, France
[4] Brigham & Womens Hosp, Dept Pathol, Boston, MA 02115 USA
[5] Dana Farber Canc Inst, Ctr Mol Oncol Pathol, Boston, MA 02215 USA
[6] Dana Farber Canc Inst, Div Pediat Hematol & Oncol, Boston, MA 02215 USA
[7] Boston Childrens Hosp, Boston, MA USA
[8] Harvard Univ, Sch Med, Dept Neurobiol, Boston, MA 02115 USA