Sameer R. Keole, M.D., is a radiation oncologist at Mayo Clinic Comprehensive Cancer Center in Phoenix, Arizona. Dr. Keole treats pediatric and adult cancers, including brain cancer, brain metastasis, acoustic neuroma, astrocytoma, glioblastoma, oligodendroglioma, breast cancer, lymphoma, prostate cancer and sarcoma, with a special emphasis on the use of radiation therapy. He is an expert in proton beam therapy. Dr. Keole is interested in new and innovative ways to improve care for people with cancer. Mayo Clinic is the #1 hospital in Arizona, according to the U.S. News & World Report, and the Cancer Center continually ranks among the top hospitals in the U.S. for Cancer. Mayo Clinic Comprehensive Cancer Center is a National Cancer Institute (NCI)-designated comprehensive cancer center.