STAT3 and colorectal carcinoma: These data indicate that TFF3 promotes PTGS2 expression and secondary PGE2 production and that PGE2, in turn, activates STAT3 and increases PTGS2 expression through PTGER4-cAMP-PKA-SRC signaling, suggesting a local feed-forward loop governing PTGS2 production in CRC cells exposed to TFF3.