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The DATA study (NCT00301457) compared 6 and 3 years of anastrozole in postmenopausal women with hormone receptor‐positive early breast cancer after 2–3 years of tamoxifen. Patients with chemotherapy‐induced ovarian function failure (CIOFF) were also eligible, but could be at risk of ovarian function recovery (OFR). The current analysis compared the survival of women with CIOFF with definitely postmenopausal...