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The advantage of letrozole over tamoxifen in the BIG 1-98 trial is consistent in younger postmenopausal women and in those with chemotherapy-induced menopause.
Chirgwin J, Sun Z, Smith I, Price KN, Thürlimann B, Ejlertsen B, Bonnefoi H, Regan MM, Goldhirsch A, Coates AS; BIG 1-98 Collaborative and International Breast Cancer Study Groups. Chirgwin J, et al. Breast Cancer Res Treat. 2012 Jan;131(1):295-306. doi: 10.1007/s10549-011-1741-6. Epub 2011 Sep 4. Breast Cancer Res Treat. 2012. PMID: 21892704 Free PMC article. Clinical Trial.
Assessment of letrozole and tamoxifen alone and in sequence for postmenopausal women with steroid hormone receptor-positive breast cancer: the BIG 1-98 randomised clinical trial at 8·1 years median follow-up.
Regan MM, Neven P, Giobbie-Hurder A, Goldhirsch A, Ejlertsen B, Mauriac L, Forbes JF, Smith I, Láng I, Wardley A, Rabaglio M, Price KN, Gelber RD, Coates AS, Thürlimann B; BIG 1-98 Collaborative Group; International Breast Cancer Study Group (IBCSG). Regan MM, et al. Lancet Oncol. 2011 Nov;12(12):1101-8. doi: 10.1016/S1470-2045(11)70270-4. Epub 2011 Oct 20. Lancet Oncol. 2011. PMID: 22018631 Free PMC article. Clinical Trial.