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. 2015 Nov 9;5:16553. doi: 10.1038/srep16553

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(A) Kaplan-Meier curves for breast cancer patients with ER-negative status (n = 239). (B) Kaplan-Meier curves for breast cancer patients with ER-positive status (n = 508). The differences between the two curves were access by the two-sided log-rank test. The number of patients at risk was listed below the survival curves.