Pancreatic cancer is a leading cause of cancer death worldwide. Cytoplasmic polyadenylation element binding protein 1 (CPEB1) is a fundamental translation regulatory factor regulating the polyadenylation process of messenger RNA. However, its biological functions in pancreatic cancer are poorly understood. Here the CPEB1 gene was knocked down or overexpressed in JF-305 cell line. To investigate the role of CPEB1 and new interacting proteins, proteomic analysis was performed using LC-MS/MS approach.