Summary
A study to learn about safety and find out maximum tolerable dose of palbociclib given in
combination with chemotherapy (temozolomide with irinotecan or topotecan with
cyclophosphamide) in children, adolescents and young adults with recurrent or refractory
solid tumors (phase 1). Neuroblastoma tumor specific cohort to further evaluate antitumor
activity of palbociclib in combination with topotecan and cyclophosphamide in children,
adolescents, and young adults with recurrent or refractory neuroblastoma. Phase 2 to
learn about the efficacy of palbociclib in combination with irinotecan and temozolomide
when compared with irinotecan and temozolomide alone in the treatment of children,
adolescents, and young adults with recurrent or refractory Ewing sarcoma (EWS).