Study of Efficacy and Safety of Ribociclib (LEE011) in Combination With Topotecan and Temozolomide (TOTEM) in Pediatric Patients With Relapsed or Refractory Neuroblastoma and Other Solid Tumors

The study is structured into two parts: Phase I - Part A (dose finding) and Phase I - Part B (multiple expansion cohorts). Phase II may commence following the evaluation of Phase I data, which includes safety, tolerability, efficacy, pharmacokinetics, and biomarker data. Additionally, other emerging data that could influence the treatment landscape will be considered before initiating Phase II in patients with relapsed or refractory neuroblastoma (NB) and/or other tumors studied in Phase I. \- Phase I - Part A (dose finding): This phase aims to determine the maximum tolerated dose (MTD) and/or the recommended Phase II dose (RP2D) of ribociclib in combination with TOTEM. Due to the early termination of the trial, Phase I - Part B (multiple expansion cohorts) and Phase II (double-blind, randomized, placebo-controlled in relapsed or refractory NB) were not initiated.