ArticleMedical journal of the Islamic Republic of Iran2026
Diabetes Status and the Association Between a Coronary Artery Disease Polygenic Risk Score and Incident Coronary Artery Disease in an Iranian Prospective Cohort.
Article in Medical journal of the Islamic Republic of Iran, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Polygenic risk scores (PRSs) for coronary artery disease (CAD) may provide a quantitative assessment of inherited susceptibility that extends beyond conventional clinical risk factors. However, the relationship between CAD PRS and the incidence of CAD may differ across various cardiometabolic risk groups. This study aimed to evaluate whether baseline diabetes status influences the association between CAD PRS and the incidence of CAD. Methods: This cohort comprised 5,139 adults from the Tehran Cardiometabolic Genetic Study (TCGS) who were free of CAD at baseline. The CAD PRS was constructed using a maximum clumping-and-thresholding approach based on external CAD genome-wide association summary statistics. Associations between the PRS and cumulative incident CAD were assessed according to diabetes status using logistic regression. Model discrimination and prediction error were evaluated using the area under the curve (AUC) and the Brier score. Results: Among 5,139 participants, 1,171 had diabetes while 3,968 did not; incident CAD occurred in 334 diabetic and 427 non-diabetic participants. After adjusting for traditional risk factors, each 1-SD increase in the PRS was associated with higher odds of incident CAD in diabetic participants (OR, 1.36; 95% CI, 1.20-1.55) and non-diabetic participants (OR, 1.27; 95% CI, 1.14-1.41). A significant interaction between PRS quintiles and diabetes status was observed ( Conclusion: CAD PRS was associated with incident CAD across diabetes-defined strata; however, its predictive relevance varied according to baseline diabetes status. These findings support the use of PRS as a marker of inherited susceptibility rather than as evidence for clinical risk reclassification or as a stand-alone predictive tool.
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