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Lung Function Predicts Outcome in Children With Obstructive Lung Disease After Hematopoietic Stem Cell Transplantation

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Kim, Kyunghoon; Lee, Hye Jin; Kim, Seongkoo; Lee, Jae Wook; Yoon, Jong-Seo; Chung, Nack Gyun; Cho, Bin

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Lippincott Williams & Wilkins Ltd.
Journal of Pediatric Hematology/Oncology, Vol.43 No.1, pp.E90-E94
Obstructive lung disease (OLD) that develops after hematopoietic stem cell transplantation (HSCT) has a significant impact on morbidity and mortality. We investigated the role of pulmonary function tests (PFTs) in the prediction of prognosis of OLD in children who have undergone HSCT. We retrospectively reviewed 538 patients who underwent allogenic HSCT in the Department of Pediatrics, Seoul St. Mary's Hospital, South Korea, from April 2009 to July 2017. OLD was identified on PFTs or chest computed tomography scans obtained from 3 months after HSCT onwards. OLD developed after HSCT in 46 patients (28 male individuals, median age: 11.2 y). The group that developed OLD with an unfavorable prognosis (n=23) had a lower forced vital capacity (FVC) (% of predicted, 78.53 +/- 24.00 vs. 97.71 +/- 16.96, P=0.01), forced expiratory volume in 1 second (FEV1) (% of predicted, 52.54 +/- 31.77 vs. 84.44 +/- 18.59, P=0.00), FEV1/FVC (%, 59.28 +/- 18.68 vs. 79.94 +/- 9.77, P=0.00), and forced expiratory flow at 25% to 75% of forced vital capacity (FEF25-75) (% of predicted, 30.95 +/- 39.92 vs. 57.82 +/- 25.71, P=0.00) at diagnosis than the group that developed OLD with a favorable prognosis (n=23). The group that developed OLD with an unfavorable prognosis had significant reductions in FVC, FEV1, FEV1/FVC, and FEF25-75 at 2 years after diagnosis. Children who develop OLD with an unfavorable prognosis after HSCT already have poor lung function at the time of diagnosis. Additional treatment should be considered in patients who develop OLD after HSCT according to their PFTs at diagnosis.
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