Furthermore, the Kaplan–Meier survival analysis showed that the high expression of SLC31A1 in breast cancer patients was related to the worse relapse-free survival (RFS) (HR = 1.48, p = 2.7e-14) (Figure 4A), distant metastasis-free survival (DMFS) (HR = 1.24, p = 0.0061) (Figure 4B), and worse overall survival (OS) trend (HR = 1.19, p = 0.075) (Figure 4C). The gene discussed is SLC31A1; the disease is breast cancer.