Is filgrastim as useless after peripheral blood stem cell transplantation for adults as it could be for children?

To the Editor: We read with interest the report by Kawano et al[1][1]concerning the use of granulocyte colony-stimulating factor (G-CSF) after peripheral blood stem cell transplantation (PBSC) in pediatric patients. The main conclusions of this study are that filgrastim does not provide a marked