The Influence of Secretin Stimulated Pancreatic Secretion on ctDNA Expression in Patients With Pancreatic Ductal Adenocarcinoma: The Role of Biomarkers in Determining the Prognosis of Pancreatic Ductal Adenocarcinoma

16 micrograms of liquid secretin will be one-time intravenously administered to patients with PDAC during the first hour of surgery. Four peripheral blood samples will then be collected. Plasmatic levels of ctDNA will be measured. Plasmatic levels of biomarkers such as mRNA, miRNA, siRNA, exoRNA, S100 proteins and amino acids, isolated from the same blood samples, will be measured and analyzed in correlation to tumor volumometry, survival rate etc. in specific intervals during follow-ups.