To compare PGE2‐biosynthesis in AC and SCC and to analyse if the miR‐574‐5p/CUGBP1 decoy mechanism is present in NSCLC tissue, we stained human lung tissue sections of AC and SCC patients for miR‐574‐5p and mPGES‐1. The gene discussed is CELF1; the disease is non-small cell lung carcinoma.