1. Cytologically or histologically confirmed pancreatic cancer

2. Patient seeking first-line chemotherapy for pancreatic cancer

3. Age\> 18 years

4. Presence of at least 1 measurable tumor lesion according to RECIST 1.1 criteria

5. Performance index ≤ 2

6. Patient able and willing to comply with the study procedures according to the protocol

7. Patient able to understand, sign and date informed consent

8. Affiliation to a social security scheme.

Evaluation of GEMCITEST in Patients With Pancreatic Cancer and Treated by Chemotherapy