PCSK9 and inflammatory bowel disease: We observed a correlation between serum PCSK9 and fecal calprotectin determination (r=0.18, P=0.04), a specific marker of intestinal inflammation in IBD patients.25 Furthermore, in line with the well-known interaction between inflammation and PCSK9,26 we found an important correlation also between PCSK9 and both the eMS and the UC-Riley Histology Index (r=0.25, P=0.007 and r=0.22, P=0.01, respectively).