Testing the Addition of an Anti-Cancer Drug, AZD1390, During Radiation Therapy for Newly Diagnosed High Grade Glioma, Diffuse Midline Glioma, or Diffuse Intrinsic Pontine Glioma

This phase I clinical trial studies the side effects and best dose of AZD1390 and to see how well it works when given together with radiation therapy for the treatment of pediatric patients with high grade glioma, diffuse midline glioma or diffuse intrinsic pontine glioma. AZD1390 is in a class of medications called kinase inhibitors. It works by blocking the signals that cause cancer cells to repair deoxyribonucleic acid damage caused by cancer treatments, such as radiation therapy. This may help overcome resistance to therapy seen in these cancers and therefore lead to increased death of cancer cells. Radiation therapy uses high energy x-rays or particles to kill cancer cells and shrink tumors. Giving AZD1390 with radiation may be safe, tolerable, and effective in treating pediatric patients with high grade glioma, diffuse midline glioma or diffuse intrinsic pontine glioma.