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Tamoxifen has been the endocrine agent of choice for adjuvant hormonal therapy for early breast cancer since approval in 1986. Five years of tamoxifen treatment produced a significant reduction in recurrence and death over more than 10 years of follow-up in women with estrogen receptor-positive (ER+) breast cancer. In large randomised trials, the standard of 5 years tamoxifen has been challenged by third-generation aromatase inhibitors (AIs) in the adjuvant setting. This review provides a synopsis of the most recent trial results and a discussion of remaining areas of uncertainties. Although currently tamoxifen still remains a valid option, increasing evidence from the new AI adjuvant trials suggests that optimised adjuvant endocrine treatment should incorporate an AI either as initial or as sequential therapy.