Integrating a polygenic risk score with the CHA2DS2-VASc score improved ischemic stroke prediction in atrial fibrillation patients (Net Reclassification Index 2.3%; 95% CI 1.3%-3.0%; P=0.002).
Observational
Yes
Does integrating polygenic risk scores with clinical risk factors improve ischemic stroke prediction in patients with atrial fibrillation?
Integrating polygenic risk scores with clinical risk factors significantly improves the prediction of ischemic stroke in patients with atrial fibrillation compared to the CHA2DS2-VASc score alone.
Effect estimate: NRI 2.3% (95% CI 1.3%–3.0%)
p-value: p=0.002
Background: Atrial fibrillation (AF) is associated with a five-fold increased risk of ischemic stroke. A portion of this risk is heritable; however, current risk stratification tools (CHA 2 DS 2 -VASc) do not include family history or genetic risk. We hypothesized that we could improve ischemic stroke prediction in patients with AF by incorporating polygenic risk scores (PRS). Methods: Using data from the largest available genome-wide association study in Europeans, we combined over half a million genetic variants to construct a PRS to predict ischemic stroke in patients with AF. We externally validated this PRS in independent data from the UK Biobank, both independently and integrated with clinical risk factors. The integrated PRS and clinical risk factors risk tool had the greatest predictive ability. Results: Compared with the currently recommended risk tool (CHA 2 DS 2 -VASc), the integrated tool significantly improved Net Reclassification Index (2.3% 95% CI, 1.3%–3.0%) and fit (χ 2 P =0.002). Using this improved tool, >115 000 people with AF would have improved risk classification in the United States. Independently, PRS was a significant predictor of ischemic stroke in patients with AF prospectively (hazard ratio, 1.13 per 1 SD 95% CI, 1.06–1.23). Lastly, polygenic risk scores were uncorrelated with clinical risk factors (Pearson correlation coefficient, −0.018). Conclusions: In patients with AF, there appears to be a significant association between PRS and risk of ischemic stroke. The greatest predictive ability was found with the integration of PRS and clinical risk factors; however, the prediction of stroke remains challenging.
O’Sullivan et al. (Mon,) conducted a observational in Atrial fibrillation. Integrated polygenic risk score (PRS) and clinical risk factors vs. CHA2DS2-VASc score was evaluated on Ischemic stroke prediction (NRI 2.3%, 95% CI 1.3%–3.0%, p=0.002). Integrating a polygenic risk score with the CHA2DS2-VASc score improved ischemic stroke prediction in atrial fibrillation patients (Net Reclassification Index 2.3%; 95% CI 1.3%-3.0%; P=0.002).
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