DPP4 and breast cancer: Genes coexpressed with DPP4 were involved in cell TGF-related pathways and networks, such as “IL-1 beta- and Endothelin-1-induced fibroblast/myofibroblast migration and extracellular matrix production in asthmatic airways”, “Development_TGF-beta-dependent induction of EMT via SMADs”, “Expression targets of tissue factor signaling in cancer”, “Cell adhesion_ECM remodeling“, and “TGF-beta-induced fibroblast/myofibroblast migration and extracellular matrix production in asthmatic airways” playing essential roles in breast cancer patients (Supplementary Figure S4, Table S2).