PRTN3 and inflammatory bowel disease: By CIA, 58/142 (40.8%) of the PSC & IBD patients [PSC-CD 13/27 (48.1%), PSC-UC 45/111 (40.5%), PSC-IBD-U 0/4] were positive for PR3-ANCA compared to 19/62 (30.6%) of the PSC with no associated IBD patients (p = 0.22).