Association of CA19-9 and tumor size in treatment monitoring for patients with metastatic pancreatic ductal adenocarcinoma (PDAC) - Hahn, Andrew; Travis, Bethnay; Hunter, David; Colorafi, Abbey; Regan, Christina; Bay, Curt; Koo, Phillip; Dragovich, Tomislav; Choti, Michael A.; Kundranda, Madappa N.; Chang, John (Journal of clinical oncology, 2023)