We next checked the independence of the evidence for multiple associations within the UBAC2 locus by carrying out a conditional logistic regression analysis of the 25 SNPs in UBAC2. After control for the genetic effect of rs3825427, none of the 24 SNPs remained significantly associated with Behçet's disease after correction for the number of SNPs tested by the conditional analysis (the smallest P = 0.0024 > 0.05/25 = 0.002). This evidence concerns the gene UBAC2 and Behcet disease.