CCL2 and pancreatic neoplasm: At the transcript level, mRNA expression of Ccl2, Ccl7, Cxcl1, Cxcl3, and Csf2 was markedly downregulated in Ccn1‐deficient pancreatic tumors (Figure 3K), whereas Cxcl5, Csf1, and Csf3 expression remained unchanged, and Ccl20 mRNA was elevated (Figure S5B, Supporting Information).