Age-dependent variation of fecal calprotectin in cystic fibrosis and healthy children.

BACKGROUND: Fecal calprotectin may be used as a non-invasive method to assess the effect of novel therapies on the gut in cystic fibrosis (CF).

METHOD: Stools from CF patients and healthy controls (HC) (0-10years old) were prospectively collected for evaluation of temporal trends.

RESULTS: 130 CF samples (64 subjects) and 114 HC samples (101 subjects) were collected. Overall, fecal calprotectin levels were different in CF patients and HC from 0 to 10years (P=0.0002). Fecal calprotectin in CF was significantly lower than HC from 0 to 1years (P=0.03) and demonstrated an upward trajectory until 4years. From >4 to 10years calprotectin was consistently higher in CF patients compared with HC (P=0.007).

CONCLUSIONS: Fecal calprotectin levels in children with CF and HC were age-dependent and had distinct trajectories. Careful interpretation of calprotectin is required if used in drug trials for CF, particularly in children less than 4years old.