Study conducted by Civeira et al. compared in a double-blind, randomised and placebo-controlled trial the effects of gemfibrozil (1200 mg/ day) and simvastatin (20 mg/ day) on lipids, apolipoprotein AI, apolipoprotein B, and apolipoprotein E and on lipids and apolipoprotein B content in VLDL, intermediate-density lipoprotein (IDL), LDL, and HDL in 10 patients with type III hyperlipoproteinemia.