Excess Apolipoprotein B and Cardiovascular Risk in Women and Men

This study introduced a refined concept — “excess apoB,” meaning apolipoprotein B higher than expected for a person’s LDL cholesterol — and showed it predicts risk that LDL alone misses, in both sexes.

In over 95,000 people, excess apoB was associated, in a dose-dependent way, with higher risk of heart attack and atherosclerotic disease. Women with the most excess apoB had a 75 percent higher risk of cardiovascular disease; men, 52 percent higher. Crucially, this risk persisted across the entire range of LDL levels — even patients with low or normal LDL were at elevated risk if their apoB ran high relative to it.

The finding captures, in a single intuitive metric, why apoB outperforms LDL: it reflects the number of atherogenic particles (including small dense LDL and triglyceride-rich remnants) that LDL cholesterol underestimates when they are present.

We rate the evidence strong. A large, contemporary prospective cohort, it adds compelling, sex-specific support to measuring apoB and acting on discordance — reinforcing the apoB-centric theme that runs through the modern lipid literature.