As the PDAC cell line was found to spontaneously produce CCL25 (Supplementary Figure 8A), and delivery of chemokine to tumor-bearing, non-immunized mice was not effective due to the extremely fast tumor growth, we further sought to rule out the role of chemotactic activity by the tumor itself and to assess its expansion in recipient unable to produce CCL25. This evidence concerns the gene CCL25 and neoplasm.