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Lee MR, Huang HL, Keng LT, Chang HL, Sheu CC, Fu PK, Wang JY, Chong IW, Shih JY, Yu CJ. Establishing Aspergillus-Specific IgG Cut-Off Level for Chronic Pulmonary Aspergillosis Diagnosis: Multicenter Prospective Cohort Study. J Fungi (Basel) 2021; 7:jof7060480. [PMID: 34204844 PMCID: PMC8231598 DOI: 10.3390/jof7060480] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/08/2021] [Accepted: 06/09/2021] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVES Aspergillus-specific IgG (Asp-IgG) cut-off level in diagnosing chronic pulmonary aspergillosis (CPA) remains unknown. METHODS We prospectively recruited participants with clinical suspicion of CPA in three centers in Taiwan during 2019 June to 2020 August. Serum Aspergillus fumigatus-specific IgG (Asp-IgG) (Phadia, Uppsala, UPPS, Sweden) was examined. Optimal cut-off level was determined by Youden's index and validated. RESULTS A total of 373 participants were recruited. In the derivation cohort (n = 262), Asp-IgG had an area under the receiver-operating-characteristic curve (AUC) of 0.832. The optimal cut-off level was 40.5 mgA/L. While applying this cut-off level to the validation cohort (n = 111), the sensitivity and specificity were 86.7% and 80.2%. Lowering the cut-off level from 40.5 to 27 mgA/L, the sensitivity was steady (30/36, 83.3% to 31/36, 86.1%) while specificity dropped from 81.9% (276/337) to 63.5% (214/337). Restricting CPA diagnosis to only chronic cavitary pulmonary aspergillosis (CCPA) and chronic fibrosing pulmonary aspergillosis (CFPA) yielded a cut-off level of 42.3 mgA/L in the derivation cohort with a sensitivity of 100% and specificity of 84.4% in the validation cohort. CONCLUSIONS Serum Asp-IgG performs well for CPA diagnosis and provides a low false-positive rate when using a higher cut-off level (preferably around 40 mgA/L).
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Affiliation(s)
- Meng-Rui Lee
- Department of Internal Medicine, National Taiwan University Hospital, Taipei 10002, Taiwan; (M.-R.L.); (L.-T.K.); (J.Y.-S.); (C.-J.Y.)
- Department of Internal Medicine, National Taiwan University Hospital Hsin-Chu Branch, Hsin-Chu 30059, Taiwan
| | - Hung-Ling Huang
- Department of Internal Medicine, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung 80145, Taiwan; (H.-L.H.); (H.-L.C.)
- Division of Pulmonary and Critical Care Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Kaohsiung 80708, Taiwan; (C.-C.S.); (I.-W.C.)
- Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Kaohsiung 80708, Taiwan
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Li-Ta Keng
- Department of Internal Medicine, National Taiwan University Hospital, Taipei 10002, Taiwan; (M.-R.L.); (L.-T.K.); (J.Y.-S.); (C.-J.Y.)
- Department of Internal Medicine, National Taiwan University Hospital Hsin-Chu Branch, Hsin-Chu 30059, Taiwan
| | - Hsu-Liang Chang
- Department of Internal Medicine, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung 80145, Taiwan; (H.-L.H.); (H.-L.C.)
- Division of Pulmonary and Critical Care Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Kaohsiung 80708, Taiwan; (C.-C.S.); (I.-W.C.)
| | - Chau-Chyun Sheu
- Division of Pulmonary and Critical Care Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Kaohsiung 80708, Taiwan; (C.-C.S.); (I.-W.C.)
- Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Kaohsiung 80708, Taiwan
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Pin-Kuei Fu
- Department of Critical Care Medicine, Taichung Veterans General Hospital, Taichung 40705, Taiwan
- Ph.D. Program in Translational Medicine, National Chung Hsing University, Taichung 40254, Taiwan
- College of Human Science and Social Innovation, Hungkuang University, Taichung 43302, Taiwan
- Department of Computer Science, Tunghai University, Taichung 40704, Taiwan
- Correspondence: (P.-K.F.); (J.-Y.W.)
| | - Jann-Yuan Wang
- Department of Internal Medicine, National Taiwan University Hospital, Taipei 10002, Taiwan; (M.-R.L.); (L.-T.K.); (J.Y.-S.); (C.-J.Y.)
- Correspondence: (P.-K.F.); (J.-Y.W.)
| | - Inn-Wen Chong
- Division of Pulmonary and Critical Care Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Kaohsiung 80708, Taiwan; (C.-C.S.); (I.-W.C.)
- Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Kaohsiung 80708, Taiwan
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
- Departments of Respiratory Therapy, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan
- Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
| | - Jin-Yuan Shih
- Department of Internal Medicine, National Taiwan University Hospital, Taipei 10002, Taiwan; (M.-R.L.); (L.-T.K.); (J.Y.-S.); (C.-J.Y.)
| | - Chong-Jen Yu
- Department of Internal Medicine, National Taiwan University Hospital, Taipei 10002, Taiwan; (M.-R.L.); (L.-T.K.); (J.Y.-S.); (C.-J.Y.)
- Department of Internal Medicine, National Taiwan University Hospital Hsin-Chu Branch, Hsin-Chu 30059, Taiwan
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