Olaparib in Treating Patients With Advanced Glioma, Cholangiocarcinoma, or Solid Tumors With IDH1 or IDH2 Mutations

This phase II trial studies how well olaparib works in treating patients with glioma, cholangiocarcinoma, or solid tumors with IDH1 or IDH2 mutations that has spread from where it first started (primary site) to other places in the body (metastatic) and that does not respond to treatment (refractory). Olaparib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth.