Project Number: 5442-32000-014-12
Start Date: Jun 01, 2014
End Date: May 31, 2019
Ractopamine is a beta-agonist repartitioning agent that has been used as a growth promoter in hogs for about 15 years, it has subsequently been approved for use in cattle and turkeys. Zilpaterol, another beta-agonist leanness agent, has been approved as growth promoter for cattle. Information on long-term exposure to ractopamine and/or zilpaterol through meat consumption and their effects to human health outcome is needed. This study will measure ractopamine and/or zilpaterol urine concentrations in human subjects from early stage breast cancer, lung cancer patients, and healthy participants. The chemical analysis will be carried out using high performance liquid chromatography coupled with tandem mass spectrometry or other suitable techniques to achieve high specificity and sensitivity. The results will be correlated with dietary information particularly with meat intake where ractopamine or zilpaterol might have been present. Variants or co-variants of ractopamine or zilpaterol exposures will be used for risk assessments for these two cancer types (breast cancer or lung cancer).