Pharmacokinetics of human-mouse chimeric anti-GD2 mAb ch14.18 in a phase I trial in neuroblastoma patients

A comprehensive analysis of the pharmacokinetics of human-mouse chimeric anti-ganglioside GD2 antibody mAb ch 14.18 was performed during a phase I clinical trial of ten children with neuroblastoma and one adult with osteosarcoma. The patients received a total of 20 courses of ch 14.18 at dose levels from 10 mg/m² to 200 mg/m². The plasma clearance of ch 14.18 was biphasic. Following the first course of treatmentt1/2,α was 3.4±3.1 h andt1/2,β 66.6±27.4 h in 9/10 children. Thet1/2,β values were significantly less than those of 181±73 h previously reported in adult melanoma patients (P<-0.001), and 147.5 h in the adult osteosarcoma patient in our trial. The latter suggests different pharmacokinetics of mAb ch 14.18 in children and adults. After a second course of treatment, administered to 5/10 children,t1/2,β decreased significantly from 72.9±19.8 h to 31.7±18.4 h (P=0.015). We there-fore conclude that the elimination kinetics of mAbs ch 14.18 in children and adults are different, and furthermore that repeated administration of mAb ch 14.18 to children with neuroblastoma leads to accelerated antibody clearance.