Conditional analysis of single nucleotide polymorphisms (SNPs) in genome-wide association studies (GWAS) is a well-established and successful method used to account for and identify secondary association signals.
The claim states that conditional analysis of a SNP in a GWAS accounts for secondary association signals. Papers [2], [3], [5], and [9] all explicitly utilize or discuss conditional analysis as the primary method to detect, distinguish, and account for secondary/independent association signals at GWAS loci. Therefore, the evidence overwhelmingly supports the claim, resulting in a 'SUPPORTED' verdict.