Stephen Abel, DO Stephen Abel, DO, is a radiation oncologist with AHN Cancer Institute, specializing in the diagnosis and treatment of various cancers including brain tumors, bladder, breast, colorectal, and esophageal cancers. He is skilled at radiosurgery and stereotactic body radiotherapy. Dr. Abel received his Master’s in Health Services Administration and his Doctor of Osteopathic Medicine at Lake Erie College of Osteopathic Medicine in Bradenton, Florida. He did his residency at Allegheny Health Network in Pittsburgh, Pennsylvania. Dr. Abel is certified by the American Board of Radiology and is associated with the American Society for Radiation Oncology. He sees patients ages 18 and older.