CDH1 and breast cancer: Moreover, reduced E-cadherin expression predicted poor OS (HR = 2.29; 95% CI: 1.21–4.31; p = 0.011), PFS (HR = 4.02; 95% CI: 2.34–6.91; p < 0.001), and RFS (HR = 3.31; 95% CI: 1.93–5.67; p < 0.001) in BC patients with a follow-up time greater than or equal to 40 months and poor OS (HR = 3.28; 95% CI: 2.19–4.92; p < 0.001) and PFS (HR = 12.70; 95% CI: 6.85–23.55; p < 0.001), but not poor RFS (HR = 2.42; 95% CI: 0.85–6.89; p = 0.098), in BC patients with a follow-up time less than 40 months.