Abstract
This phase III trial investigates the best dose of vinblastine in combination with
selumetinib and the benefit of adding vinblastine to selumetinib compared to selumetinib
alone in treating children and young adults with low-grade glioma (a common type of brain
cancer) that has come back after prior treatment (recurrent) or does not respond to therapy
(progressive). Selumetinib is a drug that works by blocking a protein that lets tumor cells
grow without stopping. Vinblastine blocks cell growth by stopping cell division and may kill
cancer cells. Giving selumetinib in combination with vinblastine may work better than
selumetinib alone in treating recurrent or progressive low-grade glioma.

