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Prediction of ELT benefit by MP on the basis of DFS and BCFI event rate. K-M analysis of (A, B) DFS and (C, D) BCFI comparing ELT versus placebo in patients with MP low-risk (n = 1,160) and patients with MP high-risk (n = 706) tumors. BCFI, breast cancer-free interval; DFS, disease-free survival; ELT, extended letrozole therapy; HR, hazard ratio; K-M, Kaplan-Meier; MP, MammaPrint.
