The HCV MC vasculitis cohort had greater gene expression of IRF2BP2 when compared to the other study groups [2.10 ± 0.90 (NV), 5.10 ± 0.80 (HCV MC-Vasc), 3.10 ± 0.90 (HCV), 3.40 ± 0.80 (HIV/HCV); p = 0.03 between HCV MC-Vasc and HCV viremic]. This evidence concerns the gene IRF2BP2 and vasculitis.