TFPI and inflammatory bowel disease: Data about the plasma concentration of natural coagulation inhibitors in IBD patients are conflicting: some authors reported no differences in PS [3,57,58] and AT [49,59] levels between IBD patients and controls, whereas others described a decrease in AT, TFPI, PC and PS in active vs inactive disease or vs controls [43,56,57,60]; finally some others found higher levels of PC and PS in IBD patients vs controls [43].