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Extending the duration of endocrine treatment for early breast cancer: patient-level meta-analysis of 12 randomised trials of aromatase inhibitors in 22 031 postmenopausal women already treated with at least 5 years of endocrine therapy

10 December 2025
Breast
BJSA
BJS Academy
0000-0000
BJS Foundation Limited
London, UK
Early Breast Cancer Trialists' Collaborative Group.
Lancet 2025; 406: 603-614.
This analysis included 22,301 women. Allocation to aromatase inhibitor treatment after five years of endocrine therapy reduced recurrence (relative risk 0.71, 95 per cent confidence interval 0.61 to 0.81, P=0.001), but not overall survival (0.90, 0.7 to 1.15, P=0.4). Risk of recurrence was greater in women with node positive disease.
Comment: The best evidence that prolonging hormone therapy reduces recurrence, but disappointingly, not death. Perhaps follow-up needs to be longer for the latter.
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