Pretreatment Carbohydrate Antigen 19-9 Level Indicates Tumor Response, Early Distant Metastasis, Overall Survival, and Therapeutic Selection in Localized and Unresectable Pancreatic Cancer

For patients with localized and unresectable pancreatic cancer, pretreatment CA 19-9 level could be helpful in predicting tumor response, DM3m, and overall survival and identifying patients who will benefit from CRT.