Expanded clinical evaluation of lovastatin (EXCEL) study results: Effect of patient characteristics on lovastatin-induced changes in plasma concentrations of lipids and lipoproteins

Abstract

Background. Lovastatin produces consistent dose-related reductions in plasma levels of low density lipoprotein (LDL) cholesterol along with variable decreases in triglycerides and increases in high density lipoprotein (HDL) cholesterol. Patient characteristics from the Expanded Clinical Evaluation of Lovastatin (EXCEL) study were examined to determine their association with the magnitude of lovastatin-induced changes in these lipids and lipoproteins. Methods and Results. After a baseline period consisting of dietary therapy, 8,245 patients with moderate hypercholesterolemia were randomized to five groups that received 48 weeks of treatment with either placebo or daily doses of lovastatin ranging from 20 to 80 mg. By use of linear statistical models, 20 different patient characteristics were examined for modification of the dose-dependent responses observed. For LDL cholesterol, the following were associated with enhanced lowering (p<0.05; percent changes are placebo-corrected, adjusted mean changes from baseline for the 80-mg/day lovastatin group): full drug compliance (-4L9%) versus 80% compliance (-20.3%); an age of 65 (-43.4%) versus 45 years (-38.1%) for women; white race (-40.9%) versus black race (-38.0%); and 4.5-kg weight gain (-42.6%) versus 4.5-kg weight loss (-37.9%). Similar relations for enhanced triglyceride lowering were found with older age and weight gain. Patients with initially low HDL cholesterol (<0.91 mmol/l) and high triglycerides (>2.26 mmol/1) had enhanced responses for these parameters: placebo-corrected percent changes at 80 mg/day were -27.4% for triglycerides and +12.3% for HDL cholesterol. Conclusions. Overall, patient characteristics had very little impact of clinical importance on the dose-dependent LDL cholesterol lowering found with lovastatin. In patients with initially high levels of triglycerides and low levels of HDL cholesterol, the elevation of HDL cholesterol produced by lovastatin appears to be enhanced.