CETP deficiency appears to be a frequent cause of increased HDL levels in the population of Japan, possibly because of a founder effect. The results that we observed in heterozygotes suggest that CETP normally plays a part in the regulation of levels of HDL subclass 2. There was no evidence of premature atherosclerosis in the families with CETP deficiency. In fact, the lipoprotein profile of persons with CETP deficiency is potentially antiatherogenic and may be associated with an increased life span.

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