CEACAM5 and neoplasm: There were no statistically significant differences in age, sex, the tumor location (pancreatic head versus (vs.)pancreatic body and tail), unresectability status (UR-LA vs. UR-M), serum carcinoembryonic antigen (CEA) level, cancer antigen 19-9 (CA19-9) level, tumor size, and T-, N-, and M-categories according to the Tumor-Node-Metastasis (TNM) classification before treatment between patients with and without conversion surgery.