title: External neutron beam therapy.
mesh_terms: D000230:Adenocarcinoma / Q000532:radiotherapy; D001932:Brain Neoplasms / Q000532:radiotherapy; D006258:Head and Neck Neoplasms / Q000532:radiotherapy; D006801:Humans; D008545:Melanoma / Q000532:radiotherapy; D009502:Neutrons; D011882:Radiotherapy, High-Energy; D012509:Sarcoma / Q000532:radiotherapy; D001749:Urinary Bladder Neoplasms / Q000532:radiotherapy