The present invention provides compositions comprising therapeutic nucleicacids such as interfering RNA thattarget apolipoprotein C-III (APOC3) gene expression, lipid particlescomprising one or more (e.g., a cocktail) of the therapeuticnucleic acids, methods of making the lipid particles, and methods ofdelivering and/or administering the lipid particles (e.g., forthe treatment of lipid diseases or disorders such as atherosclerosis or adyslipidemia such as hypertriglyceridemia orhypercholesterolemia).