Objective: To determine the effects of the reduction of intestinal cholesterol absorption with CP-184,623 on serum cholesterol levels in men with mild hyperlipidemia. Methods: In an outpatient study in a university medical center, healthy male volunteers (n = 25) with borderline-high serum cholesterol levels participated in a double-blind, placebo-controlled parallel-group study. A 3-week dietary run-in period was followed by 2 weeks of treatment with either CP-148,623 (300 mg twice a day; n = 12) or placebo (n = 13). Results: Fractional cholesterol absorption (by the dual-isotope, continuous-feeding technique), fecal neutral sterol excretion, and serum lipids were measured after the diet run-in and after the treatment periods. CP-148,623 caused a marked inhibition (by 38%) of fractional cholesterol absorption (50% ± 2% [baseline] to 31% ± 1%) and a 71% increase in fecal neutral sterol excretion (481 ± 39 mg/day [baseline] to 804 ± 55 mg/day), compared with negligible changes in the placebo group (p <0.0001 for both). Mean percent reductions from baseline in serum low-density lipoprotein (LDL) cholesterol levels were 11.6% with CP-148,623 (119 ± 17 mg/dl to 104 ± 13 mg/dl) versus a nonsignificant 1.8% reduction with placebo (change with CP-148,623 versus placebo, p <0.0002). Conclusions: In healthy male volunteers with mild hypercholesterolemia, treatment for 2 weeks with 600 mg/day CP-148,623 inhibited fractional cholesterol absorption by 35% to 40%, increased fecal neutral sterol excretion by 60% to 70%, and reduced serum LDL cholesterol by 10% to 12%.
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