PGR and breast cancer: In addition, we observed that the AUC values of ER-negative, PR-negative, and in particular, triple-negative BC, were significantly increased (benign vs. ER-negative BC: AUC = 0.95, 95% CI: 0.92–0.97; benign vs. PR-negative BC: AUC = 0.93, 95% CI: 0.90–0.96; benign vs. triple-negative BC: AUC = 0.96, 95% CI: 0.91–1.00; Figure 4c, e, i).