OASL and vasculitis: Gene expression of OASL was higher in HCV MC vasculitis patients compared to the other subject cohorts [2.20 ± 0.50 (NV), 4.30 ± 0.90 (HCV MC-Vasc), 2.20 ± 0.80 (HCV), 2.70 ± 0.40 (HIV/HCV); p = 0.02 between HCV MC-Vasc and HCV viremic].