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Univariate analyses by dichotomized autoantibodies to thyroid peroxidase (TPOAb). Kaplan-Meier curves relative to breast cancer (BC) outcome (median follow-up 96.7 months) in patients positive (≥6 kIU/L) and negative (<6 kIU/L) for TPOAb. HR, hazard ratio (HR <1 indicates a favourable BC outcome); 95% CI, 95% confidence interval. a Disease-free survival. b Overall survival. c Time to recurrence.
