Visit 1: Patients will have at least one visit with investigator (or investigator designee) prior to the study to review clinical history and prior treatment of pancreatic adenocarcinoma, and to explain the study. Correlative radiology studies including CT, MRI and 18F FDG-PET/CT as per institutional routine clinical care, and any clinically-directed laboratory tests performed as part of staging must be performed within 30 days of the 18F FLT-PET/CT Visit 2: The 18F-FDG-PET/CT may be done as a research scan, if the patient is unable to obtain a clinically-directed 18F-FDG-PET/CT as part of their clinical care or within 30 days of 18F FLT-PET/CT. The research 18F-FDG-PET/CT, in this instance, will be identical in procedure to the institution's clinical 18F-FDG-PET/CT. The blood glucose level will be < 200 mg/dl, before 18F-FDG injection, which is institutional standard clinical protocol. The following additional patient data will be obtained: histological diagnosis of primary and/or metastatic disease, date of diagnosis of primary and metastatic disease, gender, height, weight (for BMI), ECOG score and confirmation of absence of prior treatment.