Firstly, pan-cancer analysis (Figure 2(g)) revealed that MMP-3, a member of the matrix metalloproteinase family, was overexpressed in many types of solid tumors, including breast cancer (BRCA), cervical cancer (CESC), bile duct cancer (CHOL), colon cancer (COAD), esophageal cancer (ESCA), and pancreatic cancer (PAAD). Here, MMP3 is linked to breast cancer.