[1] Mem Sloan Kettering Canc Ctr, Dept Pediat, New York, NY 10021 USA
[2] Mexican Inst Social Secur, Res Unit 3Oncol, Mexico City, DF, Mexico
[3] CINVESTAV, Mol Biomed Program, Mexico City 14000, DF, Mexico
[4] Mexican Inst Social Secur, Oncol Res Unit, Mexico City, DF, Mexico
[5] Weill Cornell Med Coll, Div Hematol & Med Oncol, Dept Med, New York, NY USA
[6] Weill Cornell Med Coll, Dept Pharmacol, New York, NY USA