The English abstract of astudy published in a foreign language stated that there was no significantdifference in 15d-PGJ2 concentration between gastric cancer tissuesand controls [30].An earlier study showed that 15d-PGJ2 promotes the proliferation of HCA-7, a cyclooxygenase 2 (COX-2)-containingcolon cancer cell line at nanomolar concentrations. This evidence concerns the gene PTGS2 and gastric cancer.