The purpose of this funding opportunity announcement is to request applications that propose mechanistic investigations of the links between diet, lipid metabolism and tumor growth and progression. It is anticipated that this program will support fundamental studies designed to identify and define the molecular mechanisms through which lipid metabolism mediates tumor growth and progression, focusing specifically on the central role lipids play in linking diet with the biology of cancer; bridge the historically divided fields of nutrition and molecular metabolism; and stimulate research and tool development in this emerging area, which faces particular challenges because of the complexity of lipid biochemistry. For this announcement, unpublished preliminary data are limited to one figure, comprising no more than one-half page, to facilitate the entry of qualified new investigators to the field.