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Local relapse rate (LRR) of four groups. Luminal A type [hazard ratio (HR)=2.51, 95% confidence interval (95% CI), 0.84−7.52; P=0.101]. Luminal B type (HR=5.45, 95% CI, 1.65−17.98; P=0.005). Endocrine therapy (ET) group (HR=1.62, 95% CI, 0.75−3.49; P=0.220).
