This is an observational study to assess the feasibility of 1) isolating and enriching circulating tumorigenic cells from the peripheral blood of eligible pancreatic cancer patients and 2) successful gene expression profiling of these circulating tumorigenic cells.

Patients with pancreatic adenocarcinoma will be enrolled. Venous blood is collected in a standard 10 ml heparin blood collection tube. We may ask for blood samples at different times during the course of the study, specifically, before you start treatment and when your treatment changes. During the one year of the study, the physician anticipates blood samples will be collected a minimum of one and a maximum of four times. The amount of blood collected at any of these times will be 10 mL, about 1 tablespoon.

A 10 mL blood sample will be drawn from participants prior to starting chemotherapy treatment. circulating tumorigenic cells from the peripheral blood of eligible pancreatic cancer patients. During the 1 year following enrollment, in the setting of disease progression, a subsequent 10 mL blood sample may be drawn from participants prior to changing chemotherapy treatment.

of these circulating tumorigenic cells. For each blood sample collected, CTCs will be isolated, expanded, RNA extracted, gene expresion analysis performed and treatment profile sensitivity performed.