GPC1 and pancreatic ductal adenocarcinoma: For example, the research found that the cell surface proteoglycan, glypican‐1 (GPC‐1) was specifically enriched on EVs derived from cancer‐cell,9 and the GPC‐1 alone or in combination with growth factor receptor or epithelial cell adhesion molecules, could be used to diagnose pancreatic ductal adenocarcinoma.10