N Engl J Med 2021 Jul;385(5):395-405
From the Comprehensive Cancer Center (M.G., C.F.S., C.D., F.F., K.W., S.K.-S.), the Department of General Surgery (F.F., K.W., S.K.-S.), the Department of Internal Medicine I, Division of Oncology (G.G.S., R.B.), and the Department of Obstetrics and Gynecology (C.F.S., C.D.), Medical University of Vienna, Austrian Breast and Colorectal Cancer Study Group (M.G., R.J., L.S., C.F.), Breast Care Center, Hanusch Hospital (U.W.), the Department of Gynecology, Hospital Hietzing, and Karl Landsteiner Institute for Gynecological Oncology and Senology (P.S.), Vienna, the Department of Internal Medicine III and Salzburg Cancer Research Institute-Center for Clinical Cancer and Immunology Trials, Paracelsus Medical University Salzburg, Salzburg (G.R., S.G.-R., S.P.G., R.G.), the Departments of Oncology (M.B., C.S.) and Gynecology (V.B.-R.), Medical University Graz, Graz, the Department of Surgery, Ordensklinikum Linz, Linz (D.H.), the Department of Internal Medicine IV, Klinikum Wels-Grieskirchen, Wels (J.T.), the Department of Gynecology, Medical University Innsbruck, Innsbruck (D.E., C.B.), Doctor's Office Manfreda, Klagenfurt (D.M.), the Department of Surgery, Hospital Wolfsberg, Wolfsberg (E.M.-Z.), the Department of Internal Medicine, Hospital Vöcklabruck, Vöcklabruck (F.H.), the Department of Surgery, General Hospital Baden, Baden (H.T.), and the Breast Center, Doctor's Office Wette, Sankt Veit an der Glan (V.W.) - all in Austria; and the Breast Unit, University Hospital Helios, University Witten Herdecke, Wuppertal, Germany (V.B.-R.).
Background: For postmenopausal women with hormone-receptor-positive breast cancer, the most effective duration for adjuvant therapy with an aromatase inhibitor remains unclear.
Methods: In this prospective, phase 3 trial, we randomly assigned postmenopausal women with hormone-receptor-positive breast cancer who had received 5 years of adjuvant endocrine therapy to receive the aromatase inhibitor anastrozole for an additional 2 years (2-year group, receiving a total of 7 years) or an additional 5 years (5-year group, receiving a total of 10 years). The primary end point was disease-free survival. Read More