Study of Quemliclustat and Chemotherapy Versus Placebo and Chemotherapy in Patients With Metastatic Pancreatic Ductal Adenocarcinoma

Inclusion Criteria: * Have histologically or cytologically confirmed PDAC that is metastatic. * Have not been previously treated for PDAC in the metastatic setting. 1. Prior neoadjuvant and/or adjuvant therapy for PDAC is permitted if completed at least 12 months before randomization. 2. Prior palliative radiotherapy is allowed if completed at least 2 weeks prior to randomization and AEs have resolved to Grade 1 or less before randomization. 3. Prior and/or placement of a biliary stent/tube is permitted if any treatment-related AEs have improved to Grade ≤ 1 and the patient is not exhibiting any signs/symptoms of biliary obstruction. * Eastern Cooperative Oncology Group PS of 0 to 1. * At least 1 target lesion measurable by computed tomography (CT)/magnetic resonance imaging (MRI) per RECIST v1.1. not within a field of prior radiation therapy. Exclusion Criteria: * Previously treated for locally advanced, unresectable PDAC. * History of brain metastases or leptomeningeal metastases. * Prior treatment with a CD73 antagonist or inhibitor. * Underlying medical conditions that, in the investigator or sponsor's opinion, will make the administration of study-specified therapy hazardous NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.