Of the cell lines examined, CD26 overexpression was found to be limited to those derived from ascites specifically AsPC-1 pancreatic cells and to a lower extent HPAF-II pancreatic cancer cells and SKOV-3 ovarian cancer cells (Fig. 1 and Supplementary Figs. 1 and 2). The gene discussed is DPP4; the disease is familial pancreatic carcinoma.