CLINICAL TRIAL
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
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Estrogen replacement therapy, serum lipids, and polymorphism of the apolipoprotein E gene.

Clinical Chemistry 1999 August
BACKGROUND: Pharmacogenomics, the study of genetic loci that modulate drug responsiveness, may help to explain why estrogen replacement therapy (ERT) has differential effects on serum lipid and lipoprotein concentrations in postmenopausal women who inherit distinct alleles of the apolipoprotein E gene (APOE).

METHODS: We compared total-cholesterol, triglyceride, and lipoprotein (LDL and HDL) concentrations in 66 postmenopausal women receiving ERT ([+]ERT) with 174 postmenopausal women not receiving ERT ([-]ERT), controlling for three APOE genotypes divided into three groups: E2 (epsilon2/epsilon3, n = 31), E3 (epsilon3/epsilon3, n = 160), and E4 (epsilon3/epsilon4 + epsilon4/epsilon4, n = 49).

RESULTS: Mean total-cholesterol concentrations were lower in all three [+]ERT groups compared with their [-]ERT counterparts but were statistically significant only for women in group E4 (P = 0.014). The mean LDL-cholesterol concentrations were significantly lower in all three [+]ERT groups compared with their [-]ERT counterparts (P
CONCLUSIONS: Triglyceride concentrations in group E2 [+]ERT women may need to be monitored more closely than those in E3 or E4 [+]ERT women. Group E4 women should probably be targeted for ERT. Results suggest that APOE genotypes have a differential effect on serum lipids and lipoproteins in [+]ERT postmenopausal women.

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