Inclusion Criteria:  Patients with histologically-confirmed (confirmed at MSKCC) PDAC Patients must be ≥ 18 years old Signed, written Institutional Review Board (IRB)-approved Informed Consent Form (ICF). Measurable or evaluable solid disease on computed tomography (CT) or magnetic resonance imaging (MRI) scan per RECIST v1.1. Karnofsky Performance Status ≥70%. Life expectancy ≥3 months. A negative serum pregnancy test, within 1 week of the procedure, if the patient is female of reproductive potential.  Exclusion Criteria:  Patients who cannot undergo PET/CT scanning (i.e. because of weight limits, claustrophobia). Women who are pregnant or breast-feeding.