The association between extended ET and OS did not reach statistical significance (HR = 0.92, 95% CI 0.82–1.03), with wide CI in all subgroups and a clearer signal in patients previously exposed to both tamoxifen and AI (HR = 0.78, 95% CI 0.61–1.00).
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Adjuvant endocrine treatment strategies for non-metastatic breast cancer: a network meta-analysis.
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