This is a multicenter, international, phase II study of post-radiotherapy (RT) combination of ribociclib and everolimus to treat pediatric, adolescent, and young adult patients newly diagnosed with HGG and DIPG that harbor alterations of the cell cycle and/or PI3K/mTOR pathways to assess treatment efficacy. Efficacy is defined by progression-free survival (PFS; HGG [stratum A]) and Overall Survival (OS; DIPG [stratum B]), with key longitudinal biomarker correlatives. Outcomes among patients with primary thalamic, spinal cord, and/or secondary (radiation related) HGG (strata C) will be descriptively analyzed. Objective radiographic response rates and agent-specific toxicities will also be assessed, with a feasibility cohort to determine the recommended phase II dose (RP2D) of the combination of ribociclib and everolimus in patients with metastatic disease who received upfront craniospinal irradiation (stratum D)~Protocol therapy with the maintenance combination of ribociclib and everolimus must begin no later than 35 calendar days post-completion of RT. The earliest patients can begin protocol treatment is 28 calendar days post-completion of RT. Each cycle will be 28 days in duration and treatment can continue up to a total of 26 cycles. Ribociclib will be given orally once daily for 3 weeks (days 1-21), with one week off. Everolimus will be given orally daily continuously (days 1-28).
The goal of this study is to determine the efficacy of the study drugs ribociclib and everolimus to treat pediatric and young adult patients newly diagnosed with a high-grade glioma (HGG), including DIPG, that have genetic changes in pathways (cell cycle, PI3K/mTOR) that these drugs target.~The main question the study aims to answer is whether the combination of ribociclib and everolimus can prolong the life of patients diagnosed with HGG, including DIPG.