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It is unclear whether the phase of the menstrual cycle in which primary surgical treatment occurs influences disease-free survival (DFS) and overall survival (OS) in premenopausal women with breast cancer. We investigated this question in the context of a clinical trial comparing mastectomy alone with mastectomy plus adjuvant oophorectomy and tamoxifen in premenopausal women with operable breast cancer.

Mastectomy and Oophorectomy by Menstrual Cycle Phase in Women With Operable Breast Cancer