PNOC022: This study is assessing different combinations of targeted drugs that inhibit cancer growth in people with diffuse midline gliomas (DMGs).A Combination Therapy Trial Using an Adaptive Platform Design for Children and Young Adults With Diffuse Midline Gliomas (DMGs) Including Diffuse Intrinsic Pontine Gliomas (DIPGs) at Initial Diagnosis, Post-Radiation Therapy and at Time of Progression

Inclusion

• COHORT 1A AND 1B: New diagnosis of DMG with imaging and/or pathology consistent with a DMG, including spinal cord tumors. In cohort 1B, previous tumor tissue confirmation of DMG is mandatory and pathology must be consistent with a DMG including diffuse midline glioma H3K27M mutant; World Health Organization (WHO) grade III and IV H3 wildtype gliomas.
• COHORT 2A AND 2B: Diagnosis of DMG with imaging and/or pathology consistent with a DMG, including spinal cord tumors, who have complete standard-of-care radiation therapy. In cohort 2B, previous tumor tissue confirmation of DMG is mandatory and pathology must be consistent with a DMG including diffuse midline glioma H3K27M mutant; WHO grade III and IV H3 wildtype gliomas.
• COHORT 2A AND 2B: Participants must be within 4-14 weeks of completion of radiation.
• COHORT 3A AND 3B: Diagnosis of recurrent DMG with imaging and/or pathology consistent with a DMG, including spinal cord tumors, who have complete standard-of-care radiation therapy. In cohort 3B, previous tumor tissue confirmation of DMG is mandatory and pathology must be consistent with a DMG including diffuse midline glioma H3K27M mutant; WHO grade III and IV H3 wildtype gliomas.
• COHORT 3A AND 3B: Participants must have evidence of progression and not have received any treatment for this progression and have not previously received re-irradiation.
• Age 2 to 39 years
• Participants must have recovered from all acute side effects of prior therapy
• Participant body weight must be above the minimum necessary for the participant to receive ONC201 (at least 10 kg)

• From the projected start of scheduled study treatment, the following time periods must have elapsed: At least 7 days after last dose of a biologic agent or beyond time during which adverse events are known to occur for a biologic agent, 5 half-lives from any investigational agent, 4 weeks from cytotoxic therapy (except 23 days for temozolomide and 6 weeks from nitrosoureas), 6 weeks from antibodies, or 4 weeks (or 5 half-lives, whichever is shorter) from other anti-tumor therapies.

  • For participants who have received radiotherapy, participants in Cohort 2 must be between 4 and 14 weeks from the completion of local up-front radiotherapy and not have received additional therapy beyond completion of radiation therapy.
  • The use of bevacizumab to control radiation therapy-induced edema is allowed (if used for tumor-directed therapy, please see required time period above). Dosing limitations are as follows: Bevacizumab (or equivalent) for up to a maximum of 5 doses, dosing per institutional standard. There is no required washout period.
  • Prior use of temozolomide during radiation at maximum of the standard pediatric dosing (defined as 90 mg/m2 /dose continuously during radiation therapy for 42 days) or dexamethasone is allowed.
• Corticosteroids: Participants who are receiving dexamethasone must be on a stable or decreasing dose for at least 3 days prior to baseline magnetic resonance imaging (MRI) scan.
• Peripheral absolute neutrophil count (ANC) >= 1000/mm^3 (1.0g/l) AND
• Platelet count >= 100,000/mm^3 (100x10^9/l) (transfusion independent, defined as not receiving platelet transfusions for at least 7 days prior to enrollment).
• Creatinine clearance or radioisotope glomerular filtration rate (GFR) >= 70 mL/min/1.73 m^2 OR
• A serum creatinine within the normal limits for age
• Bilirubin (sum of conjugated + unconjugated) =< 1.5 x upper limit of normal (ULN) for age AND
• Serum glutamate pyruvate transaminase (SGPT)(alanine aminotransferase (ALT)) =< 2 x ULN AND
• Serum albumin >= 2 g/dL
• No evidence of dyspnea at rest, no exercise intolerance due to pulmonary insufficiency, and a pulse oximetry of > 92% while breathing room air.
• Diarrhea < grade 2 by Common Terminology Criteria for Adverse Events (CTCAE) version (v) 5.0
• Non-fasting glucose < 125 mg/dL without the use of antihyperglycemic agents
• If non-fasting glucose > 125 mg/dL, a fasting glucose should be done. If fasting glucose =< 160 mg/dL without the use of antihyperglycemic agents, participants will meet adequate metabolic function criteria
• Triglycerides of < 300 mg/dl and total cholesterol of < 300 mg/dl - can be on lipid lowering medications as needed to achieve.
• No history of congestive heart failure or family history of long QT syndrome.
• ECG must be obtained to verify the QTC. If an abnormal reading is obtained, the ECG should be repeated in triplicate. QTC < 470 msec.
• Participants with history of congestive heart failure, at risk of having or have underlying cardiovascular disease, or with history of exposure to cardiotoxic drugs must have adequate cardiac function as determined by echocardiogram. Shortening fraction of >= 27%.
• Participants with seizure disorder may be enrolled if seizure disorder is well controlled
• The effects of the study drugs on the developing human fetus are unknown. For this reason, females of child-bearing potential and males must agree to use adequate contraception. Adequate methods include: hormonal or barrier method of birth control; or abstinence prior to study entry and for the duration of study participation. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately. Males treated or enrolled on this protocol must also agree to use adequate contraception prior to the study and for the duration of study participation.
• Karnofsky >= 50 for participants > 16 years of age and Lansky >= 50 for participants =< 16 years of age. Participants who are unable to walk because of paralysis, but who are up in a wheelchair, will be considered ambulatory for the purpose of assessing the performance score.
• Participants must be willing to provide adequate tissue. A minimum of 10-20 paraffin embedded unstained slides OR 1 block with tumor content of 40% or greater is required. Participants who do not meet this criteria must be discussed with Study Chair(s).
• A legal parent/guardian or participant must be able to understand, and willing to sign, a written informed consent and assent document, as appropriate.