Can a targeted pill slow brain tumor growth after surgery?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Male and females; ages ≥ 12 years old. 2. IDH-mutant oligodendroglioma or astrocytoma with the IDH1 or IDH2 gene mutation confirmed by tissue-based diagnosis. 3. At least 1 prior surgery for glioma (including biopsy). 4. Adequate bone marrow function as evidenced by: * Absolute neutrophil count ≥ 1.5 X 109/L * Hemoglobin ≥ 9 g/dL * Platelets ≥ 100 X 109/L 5. Adequate hepatic function as evidenced by: * Serum total bilirubin ≤ 1.5 X upper limit of normal (ULN) * Aspartate aminotransferase and alanine aminotransferase: at or below the ULN * Alkaline phosphatase ≤ 2.5 X ULN 6. Adequate renal function as evidenced by a creatinine clearance (CrCl) ≥ 40 mL/min For participants in Japan, all the above inclusion criteria apply, as well as #7 and #8 below: 7. Have no immediate need of radiotherapy/chemotherapy as judged by the treating physician 8. Be able to understand and willing to sign informed consent/assent as determined by local requirements Exclusion criteria: 9. Patient is eligible for a clinical trial with vorasidenib. 10. Patients who are enrolled in a Servier-sponsored clinical trial and have completed all requirements of the trial may be eligible if the patient continues to benefit from vorasidenib and does not meet criteria for discontinuation of treatment. 11. Pregnant or breastfeeding. 12. Patients who require or who cannot withhold strong inhibitors of CYP1A2 (ciprofloxacin and fluvoxamine). Consider alternative therapies that are not strong CYP1A2 inhibitors. For participants in Japan, the above exclusion criteria do NOT apply. The applicable exclusion criteria for Japan are listed as #13 through #18 below: 13. Are participating in another investigational or interventional clinical trial 14. Have had any prior anticancer therapy other than surgery for treatment of glioma including systemic chemotherapy, radiotherapy, IDH inhibitors, and other anticancer therapies (investigational agents) 15. Are pregnant or breast feeding 16. Are men or women who will not agree to use highly effective forms of contraception during the trial 17. Have Grade 4 astrocytoma 18. Are taking strong CYP1A2 inhibitors like fluvoxamine maleate (Luvox, Depromel), etc