UBL4A and pancreatitis: To assess the role of UBL4A on PDAC proliferation and metastasis in vivo, stably transfected cell lines (CFPAC-1-Vector, CFPAC-1-UBL4A, PANC-1-shCtrl and PANC-1-shUBL4A) were used to develop a pancreatic orthotopic tumor model.