4. Clinically stage I disease by American Joint Committee on Cancer (AJCC) 7th edition. (N0, M0, T stages T1-T2a) or patients with stage T2bN0M0 (clinical stage IIA) disease who are medically unfit for standard of care chemotherapy as documented by a medical oncologist or radiation oncologist, or who refuse standard of care chemotherapy as documented by a medical oncologist or radiation oncologist.