A disadvantage of including only the most highly significant and replicated SNPs is that there may be many other SNPs with true effects that do not reach the stringent genome-wide significance levels.
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Current Applications of Genetic Risk Scores to Cardiovascular Outcomes and Subclinical Phenotypes.
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The sentences
Prior to inclusion in the GRS, SNPs identified in the EA or East Asian meta-analyses were screened to have at least nominally significant associations with BP in the Han Chinese sample.
With these limited, sometimes conflicting results, more work is needed to verify whether inclusion of additional marginally significant SNPs in GRSs is the best approach for cardiovascular traits.