In order to determine whether human cancer cells express CXCL17, an RT-PCR assay was performed using 54 human cancer cell lines (colorectal, gastric, renal, breast, non-small cell lung, pancreatic carcinoma, and melanoma) (Figure 2A and 2B, and Figure S2 and S3A). This evidence concerns the gene CXCL17 and exocrine pancreatic carcinoma.