<qa>  What is the dose of carboplatin higher at conditioning chemotherapy?Carboplatin is widely used for conditioning regimens of autologous hematopoietic stem cell transplantation for pediatric solid tumor, but the pharmacokinetics has not been evaluated in pediatric stem cell transplantation before. As carboplatin have renal toxicity, the pharmacokinetic study of carboplatin would help the safe and effective administration of carboplatin for transplantation patients. Especially, the dose of carboplatin is higher at conditioning chemotherapy, resulting in higher toxicity. 