The goal of this study is to determine the efficacy of the 1) 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 or 2) ribociclib and temozolomide to treat pediatric and young adult patients newly diagnosed with diffuse hemispheric glioma (DHG), H3G34-mutant. The main question the study aims to answer is whether the combinations of ribociclib and everolimus or ribociclib and temozolomide can prolong the life of patients diagnosed with HGG/DIPG or DHG H3G34-mutant.
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Progression-Free Survival (PFS) in HGG (Part 2, Stratum A)
Timeframe: From date on treatment until date of Progressive Disease or death due to any cause or date of last follow-up, assessed up to 60 months
Overall Survival (OS) in DIPG (Part 2, Stratum B)
Timeframe: From date on treatment until date of death due to any cause or date of last follow-up, assessed up to 60 months
Establish MTD and RP2D of ribociclib and everolimus (Part 2, Stratum D)
Timeframe: Completion of Cycle 1 (28 days)
Number of participants with ribociclib and everolimus-related adverse events as assessed by CTCAE v5.0 (Part 1- initial feasibility study)
Timeframe: Completion of Cycle 1 (28 days)
Establish RP2D of ribociclib and temozolomide (Phase 1 Run-In Stratum E)
Timeframe: Completion of Cycle 1 (28 days)