 - Patients who will require lipid-altering treatments other than study drugs K-877 or fenofibrate, statins, ezetimibe, or PCSK9 inhibitors during the course of the study. These include bile acid sequestrants, non-study fibrates, niacin 100 mgday, omega-3 fatty acids 1000 mgday, or any supplements used to alter lipid metabolism including, but not limited to, red rice yeast supplements, garlic supplements, soy isoflavone supplements, sterolstanol products, or policosanols; 