The high expression rate of 15-PGDH was 40% (14/35) in the NSCLC group and 100% (6/6) in the normal group (Table I), while the high expression rate of COX-2 was 65.7% (23/35) in NSCLC group and 0% (0/6) in normal group. This evidence concerns the gene PTGS2 and non-small cell lung carcinoma.