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Kaplan–Meier survival curves for disease‐free survival (a) and disease‐specific survival (b) for patients with breast cancer gene 1 (BRCA1)‐methylated and ‐unmethylated sporadic breast cancer. Patients with BRCA1‐methylated breast cancer had a shorter disease‐free survival (P = 0.045, two‐sided) and shorter disease‐specific survival (P = 0.038, two‐sided) in univariate analysis.
