Figure 3D (upper panel) demonstrated that the HR values for OS with the MMP3 expression of high and low-group were less than 1 for both the SCAN-B and METABRIC cohorts (p = 0.0001) but not for TCGA-BRCA cohort (p = 0.88). These data suggest that breast cancer patients with higher MMP3 expression scores are associated with a better prognosis of breast cancer patients’ survival. However, higher MMP3 expression scores are not associated with or DSS for both the METABRIC and TCGA-BRCA cohorts (Figure 3D, lower panel). Here, MMP3 is linked to breast cancer.