The development of intestinal tumours in the Min mouse is influenced by Moml locus, where the group II phospholipase A2 (PLA2-II) gene has been suggested as the candidate gene. Since no causative genetic alterations have been identified in PLA2-II in human colorectal tumours, we tested whether PLA2-II or the cytosolic isoform cPLA2, are dysregulated in human colorectal carcinogenesis. By means of RT-PCR, the expression of these genes and cyclooxygenase-2 (COX-2), which is upregulated in colorectal tumours, were examined. No changes in gene expression of PLA2-II were found in 44 tumours compared to normal mucosa. cPLA2 and COX-2 were upregulated; however, no correlation in expression was found between these genes. Thus, the supply of arachidonic acid provided by PLA2-II/cPLA2 seems not to be the rate limiting step in PGE2 (a prostaglandin/mitogen) formation via COX-2 and PLA2-II plays a minor or no role in human colorectal carcinogenesis.