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Kaplan-Meier survival curve for endocrine therapy-free postmenopausal ERα-positive breast cancer patients exhibiting varying expression levels of ERβ. Disease-free survival was analyzed using the Kaplan-Meier method in 55 patients. An ERβ-positive rate <1% was recognized as ERβ (−), between 1–70% as ERβ (+/++) and >70% as ERβ (+++). The data from 12 patients were censored due to mortality, loss to follow-up or closure of the study. ER, estrogen receptor.
