KCNQ4 and breast cancer: The results indicated that breast cancer patients with low expression of KCNQ4 had longer OS (P = 0.00459, HR = 0.88), DMFS (P = 0.041356, HR = 0.25), and RFS (P = 0.041356, HR = 0.25) compared to those with high expression of KCNQ4 (Fig. 5C), suggesting a more favorable prognosis.