Provided herein are methods, compounds, and compositions for reducing expression of ApoCIII mRNA and protein in a patient with Fredrickson Type I dyslipidemia, FCS, LPLD. Also provided herein are methods, compounds, and compositions for treating, preventing, delaying, or ameliorating Fredrickson Type I dyslipidemia, FCS, LPLD, in a patient. Further provided herein are methods, compounds, and compositions for increasing HDL levels and/or improving the ratio of TG to HDL and reducing plasma lipids and plasma glucose in a patient with Fredrickson Type I dyslipidemia, FCS, LPLD. Such methods, compounds, and compositions are useful to treat, prevent, delay, or ameliorate any one or more of pancreatitis, cardiovascular disease or metabolic disorder, or a symptom thereof.