Neutrophil lymphocyte ratio, mean platelet volume, and immunoreactive trypsinogen as early inflammatory biomarkers for cystic fibrosis in infancy: A retrospective cohort study

BackgroundAirway inflammation starts in early life in cystic fibrosis (CF) and limited, objective markers are available to help identify infants with increased inflammation. We aimed to investigate neutrophil, lymphocyte ratio (NLR), mean platelet volume (MPV) and immunoreactive trypsinogen (IRT) to be a possible inflammatory biomarker for CF in infancy. MethodsThis was a retrospective cohort study in three centers. Between January 2015 and December 2022, children with CF newborn screening (NBS) positivity and diagnosed as CF were included in the study. Correlation analysis were performed with NLR, MPV, IRT and follow-up parameters such as z-scores, modified Shwachman-Kulczycki score (mSKS) at the first, second, third and sixth ages and pulmonary function test (PFT) at the sixth age. ResultsA total of 92 children with CF included in the study and 47.8% of them were female. There were no correlations between NLR, MPV and weight and height z-scores for all ages (p > 0.05), a negative correlation was found between MPV and body mass indexes (BMI) z-score at the age of 6 (r = -0.443, p = 0.038). No correlation was found between NLR, MPV and PFT parameters and mSKS at all ages (p > 0.05). There was a negative correlation between first IRT and BMI z-score at 6 years of age (r = -0.381, p = 0.046) and negative correlations between second IRT and weight and BMI z-score at the age of 6 (r = -0.462, p = 0.010; r = -0.437, p = 0.016, respectively). ConclusionHigher MPV and IRT levels during NBS period are associated with worse nutritional outcome which may reflect chronic inflammation. Children with higher MPV and IRT should be followed up closely in terms of chronic inflammation and nutritional status