GW-501516 is a peroxisome proliferator-activator receptor-delta agonist for the potential treatment of dyslipidemia, hyperlipidemia, metabolic diseases and cardiovascular diseases. GW501516 treatment is associated with significant improvements in multiple lipid profile components (TG, LDL-C, HDL-C, free fatty acids and apoB, apoA-I and apoA-II) and a shift in LDL particle size from small dense to larger, less dense particles. Despite these promising early results, the further investigation and development of GW501516 was discontinued after observations in animal studies of its association with the rapid induction of cancers in several organs (liver, stomach, tongue, skin, bladder, ovaries, womb and testes).