PTGER4 and neoplasm: Gut epithelium differentiation (CA4, CA12, CBR1, CHGB, KLF4, KLF9, MCOLN2, SST, TFF3), apoptosis/cell death (CYCS, GSN, KITLG, SST, TFF3, TGFA), cytolisis/crypt damage (ABCB1, KLKR1, PTGER4), formation of aberrant crypt foci (NR5A2, PTGER4), drug transport (ABCB1, ABCG2), migration of tumor cells (EDG2, KITLG, SST, TGFA), quantity of colonocytes (GUCA2A)