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The carbohydrate antigen 19-9 (CA 19-9) is currently the most widely used serum tumor marker in pancreatic cancer (PC). CA 19-9 pretreatment levels as well as CA 19-9 kinetics during systemic chemotherapy can provide prognostic information regarding survival of patients with metastatic PC.

Assessing Prognosis in Metastatic Pancreatic Cancer by the Serum Tumor Marker CA 19-9: Pretreatment Levels or Kinetics during Chemotherapy?