29-Apr-2020 Enrollment of new patients into this study has been paused due to the COVID-19 situation. The duration of this pause is dependent on the leveling and control of the COVID-19 pandemic.~The drug being tested in this study is called Ixazomib. Ixazomib is being tested to determine the MTD or RP2D of intravenous ixazomib when administered in combination with multiagent chemotherapy (reinduction therapy) in pediatric participants with relapsed or refractory ALL or relapsed/refractory LLy.~The study will enroll approximately 18 participants. Doses of ixazomib will be escalated according to a standard 3+3 dose escalation schema. Participants aged >= 1 year will receive the starting dose of 1.0 mg/m^2 and participants aged <1 year will receive the starting dose of 0.03 mg/kg. Ixazomib will be administered in combination with multiagent reinduction therapy. The dose escalation phase will determine the MTD and/or RP2D of ixazomib. Dose escalation will be based on the observed safety and tolerability data.~Participants aged <1 year will be assessed separately and will not contribute to the dose escalation assessment.~This multi-center trial will be conducted in the United States and Spain. The overall time to participate in this study is approximately 30 months. Participants will be followed up to Day 60 after the first dose of study drug for a follow-up assessment.
The purpose of this study is to determine the maximum tolerated dose (MTD) and/or recommended phase 2 dose (RP2D), safety and toxicity, and pharmacokinetics (PK) of ixazomib administered intravenously in combination with multiagent reinduction chemotherapy in pediatric participants with relapsed/refractory ALL or LLy.