[1] Res Ctr, Natl Canc Inst, Div Expt Med, Rio De Janeiro, Brazil
[2] Hosp Base Apoio Brasilia, Dept Hematol & Oncol Pediat, Brasilia, DF, Brazil
[3] Infants Hosp Darcy Vargas, Sao Paulo, Brazil
[4] Dept Hematol, Rio De Janeiro, Brazil
[5] Res Ctr, Natl Canc Inst, Div Genet, Rio De Janeiro, Brazil