Journal
PEDIATRIC RESEARCH
Volume 60, Issue 5, Pages 613-618Publisher
NATURE PUBLISHING GROUP
DOI: 10.1203/01.pdr.0000242361.47408.51
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Circulating KL-6 is a specific indicator of pulmonary injury affecting the alveolar epithelium and interstitium. Our preliminary study suggested the usefulness of plasma KL-6 as a marker of bronchopulmonary dysplasia (BPD). To confirm the diagnostic value of KL-6 for BPD as well as to determine the reference range, we conducted a larger prospective study in 135 preterm infants < 32 wk GA. Among the infants without oxygen dependence at a postconceptional age of 36 wk, the plasma KL-6 level showed no significant association with GA at any time. Among 42 infants < 28 wk GA, plasma KL-6 levels were significantly higher in those with moderate/severe BPD compared with those with no/mild BPD. A plasma level of 199 U/mL at I wk or 232 U/mL at 2 wk was an excellent predictor of moderate/severe BPD < 28 wk GA (positive predictive value of 83% and 80%, respectively). Unlike nonspecific markers of inflammation or fibrosis, KL-6 objectively reflects the severity of pulmonary injury irrespective of the treatment or the radiographic changes. Therefore. not only as a good marker, measurement of KL-6 may also help to provide new insights into the pathogenesis of BPD.
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