title: Sector resection with or without postoperative radiotherapy for stage I breast cancer: a randomized trial. The Uppsala-Orebro Breast Cancer Study Group.
mesh_terms: D001943:Breast Neoplasms / Q000532:radiotherapy / Q000601:surgery / Q000628:therapy*; D003131:Combined Modality Therapy / Q000379:methods; D006801:Humans; D011446:Prospective Studies