We selected the co-expressed genes with the highest correlation between DEFA5 and DEFA6 (Figure 8C): KLK12, PTGDR2, ATOH1, OLFM4, and CLCA1, which are successively involved in tumorigenesis, inflammatory response, transcriptional regulation, inhibition of cell growth, induction of cell differentiation and apoptosis, and promotion of cell adhesion and tumor inhibition. The gene discussed is PTGDR2; the disease is neoplasm.