Nivolumab for Pediatric and Adult Relapsing/Refractory ALK+, for Evaluation of Response in Patients With Progressive Disease (Cohort 1) or as Consolidative Immunotherapy in Patients in Complete Remission After Relapse (Cohort 2)

Induction: nivolumab 3 mg/kg (maximal unitary dose: 240 mg) iv Q2W until CR Evaluation of response as defined below, including biopsy in case of residual masses at Week 24 Maintenance: nivolumab 3 mg/kg (maximal unitary dose: 240 mg) Q4W Total duration of treatment (induction + maintenance) = 24 months

Induction: nivolumab 3 mg/kg iv Q2W for 4 doses (Wk0, Wk2, Wk4 and Wk6) Maintenance: nivolumab 3 mg/kg Q4W, for 25 doses, starting at Week 8 (14 days after the last induction dose) Total duration of treatment (induction + maintenance) = 24 months