Echo-endoscopy Biopsy Impact on the Circulating Tumor Cell Level

A 6 ml blood sample will be taken from the portal vein, before and after the echo-endoscopic biopsy of the pancreatic mass. The second sample will be taken after the biopsy if there is no bile drainage, or after bile drainage if indicated. The delay between the end of the biopsy procedure and the puncture will be 5 minutes. A 6 ml peripheral blood sample will also be taken before and after the endoscopic procedure.