Switching to exemestane after 2–3 years of adjuvant tamoxifen prolongs disease-free survival, but not overall survival, in postmenopausal women surviving primary breast cancer, compared with continuous tamoxifen☆, ☆, ☆☆☆Abstracted from: Coombes RC, Hall E, Gibson LJ, et al. A randomized trial of exemestane after two to three years of tamoxifen therapy in postmenopausal women with primary breast cancer. N Engl J Med 2004;350:1081–92.