The degree of differentiation, distant metastasis, and other clinical characteristics of the patients were analyzed by the χ2 test and are shown in Table 1, and NRDC expression in the PDAC (771 pg/mL) was significantly lower than that in most other lesions combined (1368 pg/mL), IPMN (1308 pg/mL), or CP (1132 pg/mL) (p < 0.0001, p = 0.0054, and p = 0.0006, respectively, Supplementary Table S1). Here, CP is linked to pancreatic intraductal papillary-mucinous neoplasm.