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K-M survival analysis in single PR+ patients (stratified by endocrine therapy). K-M: Kaplan-Meier; HR: hazard ratio; CI: confidence interval; initial endocrine therapy: 5 years of treatment with tamoxifen or aromatase inhibitors; intensified endocrine therapy: 5 years of tamoxifen or aromatase inhibitor therapy followed by either its continuation or concomitant ovarian function inhibitor therapy.
