GPC1 and pancreatic ductal adenocarcinoma: The identification of specific biomarkers such as epidermal growth factor receptor (EGFR), epithelial cell adhesion molecule (EpCAM), mucin1 (MUC1), glypican (GPC1), and Wnt2 within exosomes has demonstrated their potential for the diagnosis and prognosis of pancreatic ductal adenocarcinoma (64).