PTGDR2 and malignant colon neoplasm: Moreover, the bioinformatics analysis performed by Su et al. [83] revealed six key genes associated with colon cancer prognosis, including SULT1B1, UGT2B15, PTGDR2, GPR15, BMP5, and CPT2, and the higher expression of the genes in cancerous tissues, the longer the survival of colon cancer patients.