The intracellular fatty acid-binding proteins (FABPs) belong to a multigene family. FABPs are divided into at least three distinct types, hepatic-, intestinal- and cardiac-type. They participate in the uptake, intracellular metabolism and/or transport of long-chain fatty acids, in the modulation of cell growth and proliferation. FABP3 gene contains four exons and its function is to arrest growth of mammary epithelial cells. This gene is acandidate tumor suppressor gene for human breast cancer. Here, FABP3 is linked to breast cancer.