Fecal calprotectin (FC) is used to asses the presence of intestinal inflammation also in patients with Cystic Fibrosis (CF) and recent studies showed a correlation between bowel and lung disease in these patients. The aim of this study was to analyze the levels of FC in CF and correlate them with different phenotypes of disease. We enrolled a cohort of 54 CF patients and 50 healthy controls. In these patients, calprotectin has been assayed on a stools sample using an ELISA kit. In all patients we analyzed, FC levels were elevated above the cut-off value and significantly higher than in healthy controls. Among CF patients, FC was significantly higher in patients older than 18 years, with pancreatic insufficiency, underweight status, Pseudomonas Aeruginosa airways colonization, CF-related diabetes mellitus, reduced lung function, or high number of pulmonary exacerbations. These results suggest that in patients with CF, FC levels are not only influenced by the CF enteropathy but also by the severity of the genetic disease. Since we found higher FC levels in patients with a severe phenotype (P. Aeruginosa airways colonization, FEV1<50% of predicted, pancreatic insufficiency, underweight status,) we suggest that this marker could be useful to monitor longitudinally a clinical worsening.
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