MMP2 and pancreatic ductal adenocarcinoma: Silenced YY1 promotes cell migration and invasion in pancreatic ductal adenocarcinoma by binding to the promoter region of Feline sarcoma-related (FER) and regulating signal transducer and activator of transcription 3 (STAT3)/matrix metallopeptidase 2 (MMP2) signaling pathway [15].