Apolipoprotein-B, low-density lipoprotein cholesterol, and the long-term risk of coronary heart disease in men.
We examined whether plasma apolipoprotein-B (apo-B) levels add further information on the risk of coronary heart disease (CHD) after taking into account low-density lipoprotein (LDL) cholesterol concentrations and other traditional risk factors. Among 2,072 CHD-free men from the Québec Cardiovascular Study at entry and followed for 13 years, 230 had a first CHD event (CHD death or nonfatal myocardial infarction). Increased apo-B (tertile 1 vs 3) levels were associated with a significant increased risk of CHD after adjustment for nonlipid and lipid risk factors other than LDL cholesterol levels (relative risk 1.89, 95% confidence interval 1.31 to 2.73). High plasma LDL cholesterol concentrations (tertile 1 vs 3) were also associated with an increased risk of CHD independently of nonlipid and lipid risk factors (relative risk 2.02, 95% confidence interval 1.44 to 2.84). However, apo-B levels modulated to a significant extent the risk of CHD associated with increased concentrations of LDL cholesterol (>/=4.3 mmol/L). For instance, among men with high LDL cholesterol levels, those with an apo-B level <128 mg/dl were not at increased risk for CHD (relative risk 1.53, 95% confidence interval 0.89 to 2.62). In contrast, high levels of apo-B and LDL cholesterol were associated with a significant twofold increased risk of CHD (p <0.001). Receiver-operating curve analysis also indicated that plasma apo-B levels improved the ability to discriminate incident CHD cases among patients with high LDL cholesterol levels compared with a model based on LDL cholesterol levels (p = 0.04). In conclusion, plasma apo-B levels modulated the risk of CHD associated with LDL cholesterol over a 13-year follow-up.
Institute on Nutraceuticals and Functional Foods, Ste-Foy, Québec, Canada.
Annie C
AC
St-Pierre
Bernard
B
Cantin
Gilles R
GR
Dagenais
Jean-Pierre
JP
Després
Benoît
B
Lamarche
D000328:Adult; D000368:Aged; D001055:Apolipoproteins B / Q000097:blood*; D008078:Cholesterol, LDL / Q000097:blood*; D003327:Coronary Disease / Q000097:blood* / Q000209:etiology*; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D016016:Proportional Hazards Models; D012372:ROC Curve; D012307:Risk Factors
D001055:Apolipoproteins B; D008078:Cholesterol, LDL