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We studied the effects of the bile acid sequestrant cholestyramine, alone and in combination with the experimental agent compactin (ML-236B), a competitive inhibitor of 3-hydroxy-3-methylglutaryl coenzyme A reductase, on serum levels of lipoproteins in 10 heterozygous patients with familial hypercholesterolemia. After cholestyramine treatment alone for 2 to 16 months, serum total and low-density lipoprotein cholesterol decreased by 20 and 28 per cent, respectively. With the addition of compactin for 12 weeks there was a 39 per cent total decrease in serum cholesterol from the control value--from 356 +/- 14 to 217 +/- 10 mg per deciliter (9.27 +/- 0.36 to 5.64 +/- 0.26 mmol per liter [mean +/- S.E.M.]; P less than 0.001)--and a 53 per cent decrease in low-density lipoprotein cholesterol--from 263 +/- 13 to 125 +/- 10 mg per deciliter (6.84 +/- 0.34 to 3.25 +/- 0.26 mmol per liter; P less than 0.001). High-density lipoprotein cholesterol, which had increased during cholestyramine treatment, remained at its higher level. No adverse effects were observed. If long-term safety can be demonstrated, the compactin-cholestyramine regimen may prove useful in heterozygous familial hypercholesterolemia. prove useful in heterozygous familial hypercholesterolemia.
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