CA 19-9 as a Predictor for Response and Survival in Advanced Pancreatic Cancer Patients Treated With Chemoradiotherapy

CA 19-9 decline shows a correlation with radiologic response. The combination of pretreatment CA 19-9 >1,200 U/mL, posttreatment CA 19-9 >100 U/mL, and CA 19-9 decline ≤40% may possibly serve as a surrogate marker for poor survival in advanced PC receiving chemoradiotherapy.