PDX1 and pancreatic neoplasm: To investigate the effect of Gas6 blockade in pancreatic cancer growth and metastasis, we used an orthotopic syngeneic pancreatic cancer model, in which pancreatic cancer cells derived from the gold standard genetic mouse model of pancreatic cancer (LSL-KrasG12D; LSL-Trp53R172H; Pdx1-Cre mice; KPC model), transduced with a reporter lentivirus expressing zsGreen/luciferase, were orthotopically implanted into the pancreas of syngeneic immuno-competent mice.