What is involved?
Relapsed/refractory B-precursor ALL in pediatric and adolescent patients is an aggressive malignant disease with dismal prognosis. Apart from allogeneic hematological stem cell transplantation (HSCT) there is not any other curative treatment of second relapse or refractory B-precursor ALL available. Additional therapeutic approaches are urgently needed. Blinatumomab is a bispecific single-chain antibody construct designed to link B cells and T cells resulting in T cell activation and a cytotoxic T cell response against CD19 expressing cells. The purpose of this study is to investigate the pharmacokinetics, pharmacodynamics and safety of escalating doses of the BiTE® antibody blinatumomab (MT103)in pediatric and adolescent patients with relapsed/refractory B-precursor ALL, to select a dose and to investigate the efficacy and safety of that dose of blinatumomab in above mentioned patient population. Patients will receive up to five 6-weeks cycles (4 weeks of continuous intravenous infusion followed by a 2-weeks treatment free interval) of blinatumomab treatment.