Osimertinib With or Without Bevacizumab in Treating Patients With EGFR Positive Non-small Cell Lung Cancer and Brain Metastases

This phase II trial studies how well osimertinib with or without bevacizumab works in treating patients with EGFR positive non-small cell lung cancer that has spread to the brain (brain metastases). Osimertinib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Bevacizumab may stop or slow non-small cell lung cancer by blocking the growth of new blood vessels necessary for tumor growth. Giving osimertinib with or without bevacizumab may work better in treating patients with non-small cell lung cancer.