CDH1 and breast cancer: Regarding tumor extent, reduced E-cadherin expression predicted poor OS (HR = 3.44; 95% CI: 1.67–7.07; p = 0.001), PFS (HR = 3.67; 95% CI: 2.02–6.70; p = 0.003), and RFS (HR = 2.78; 95% CI: 1.43–5.40; p = 0.019) for NMIBC; and with poor OS (HR = 2.53; 95% CI: 1.53–4.18; p < 0.001), PFS (HR = 10.94; 95% CI: 6.29–19.03; p < 0.001), and RFS (HR = 3.23; 95% CI: 1.28–8.33; p = 0.013) for mixed BC (NMIBC + MIBC).