Elevated Pretreatment Plasma Oncostatin M Is Associated With Poor Biochemical Response to Infliximab

Background: We hypothesized that elevations of plasma Oncostatin M (OSM) would be associated with infliximab nonresponse. Methods: Plasma OSM was measured in Crohn disease patients pre-infliximab with biochemical response (>50% reduction in fecal calprotectin) as the primary outcome. Results: The median OSM in biochemical responders was 86 (69-148) pg/mL compared with 166 (74-1766) pg/mL in nonresponders (P = 0.03). Plasma OSM > 143.5 pg/mL was 71% sensitive and 78% specific for biochemical nonresponse (area under the curve 0.71). Early biochemical nonremission was also associated with an elevated neutrophil CD64 expression (odds ratio 8.9, P = 0.011). Conclusions: Elevated preinfliximab plasma OSM and nCD64 surface expression were both associated with poor biochemical outcomes.