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Early diagnosis of invasive pulmonary aspergillosis (IPA) is crucial to prevent lethal disease in immunocompromized hosts. So far, lipopolysaccharide binding protein (LBP) and bactericidal/permeability-increasing protein (BPI) levels have not been evaluated as biomarkers for IPA. IL-8, previously introduced as a biomarker for IPA, was also included in this study. Bronchoalveolar lavage fluid (BALF) of IPA patients and control patients with non-infectious lung disease was collected according to clinical indications. Measurements in BALF displayed significantly higher levels of LBP ( p &lt; 0.0001), BPI ( p = 0.0002) and IL-8 ( p &lt; 0.0001) in IPA compared to control patients. Receiver operating characteristic curve analysis revealed higher AUC for LBP (0.98, 95% CI 0.95-1.00) than BPI (0.84, 95% CI 0.70-0.97; p = 0.0301). Although not significantly different, AUC of IL-8 (0.93, 95% CI 0.85-1.00) also tended to be higher than AUC for BPI ( p = 0.0624). When the subgroup of non-hematological patients was analyzed, test performance of LBP (AUC 0.99, 95% CI 0.97-1.00), BPI (AUC 0.97, 95% CI 0.91-1.00) and IL-8 (AUC 0.96, 95% CI: 0.90-1.00) converged. In conclusion, LBP and-to a lesser extend-BPI displayed high AUCs that were comparable to those of IL-8 for diagnosis of IPA in BALF. Further investigations are worthwhile, especially in non-hematological patients in whom sensitive biomarkers for IPA are lacking.

Lipopolysaccharide Binding Protein and Bactericidal/Permeability-Increasing Protein as Biomarkers for Invasive Pulmonary Aspergillosis