The rationale for this trial is based on the increasing evidence linking inflammatory processes and the development of a number of cancers, including bowel cancer. This has focused attention on the role of inflammatory mediators in the development of cancer. In particular, the family of eicosanoids (including 2-series prostaglandins, 4-series leukotrienes and thromboxanes) produced through conversion of the omega-6 PUFA, arachidonic acid, via cyclo-oxygenase-2 (COX-2) is believed to contribute to the physiological processes of inflammation and the development of tumours. Prostaglandin E2, a product of the conversion of arachidonic acid via the COX-2 pathway, has been implicated in tumourigenesis through: