Pembrolizumab and Stereotactic Radiosurgery for Melanoma or Non-Small Cell Lung Cancer Brain Metastases

This pilot trial studies the side effects of giving pembrolizumab together with stereotactic radiosurgery to treat patients with melanoma or non-small cell lung cancer that has spread to the brain. Monoclonal antibodies, such as pembrolizumab, may interfere with the ability of tumor cells to grow and spread. Stereotactic radiosurgery is a specialized radiation therapy that delivers a single, high dose of radiation directly to the tumor and may cause less damage to normal tissue. Giving pembrolizumab together with stereotactic radiosurgery may be a better treatment for patients with melanoma or non-small cell lung cancer that has spread to the brain.