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Jehn LB, Costabel U, Boerner E, Wälscher J, Theegarten D, Taube C, Bonella F. Serum KL-6 as a Biomarker of Progression at Any Time in Fibrotic Interstitial Lung Disease. J Clin Med 2023; 12:jcm12031173. [PMID: 36769819 PMCID: PMC9917700 DOI: 10.3390/jcm12031173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 01/26/2023] [Accepted: 01/30/2023] [Indexed: 02/05/2023] Open
Abstract
The development of a progressive phenotype of interstitial lung disease (ILD) is still unpredictable. Whereas tools to predict mortality in ILD exist, scores to predict disease progression are missing. The aim of this study was to investigate whether baseline serum KL-6 as an established marker to assess disease activity in ILD, alone or in combination with clinical variables, could improve stratification of ILD patients according to progression risk at any time. Consecutive patients with fibrotic ILD, followed at our institution between 2008 and 2015, were investigated. Disease progression was defined as relative decline of ≥10% in forced vital capacity (FVC) or ≥15% in diffusing capacity of the lung for carbon monoxide (DLco)% from baseline at any time. Serum KL-6 was measured using an automated immunoassay (Fujirebio Europe, Gent, Belgium). A stepwise logistic regression was performed to select variables to be included in the score. A total of 205 patients (49% idiopathic pulmonary fibrosis (IPF), 51% fibrotic nonspecific interstitial pneumonia (NSIP)) were included, of them 113 (55%) developed disease progression during follow up. Male gender (G) and serum KL-6 strata (K) were significant predictors of progression at regression analysis and were included in the GK score. A threshold of 2 GK score points was best for discriminating patients at high risk versus low risk to develop disease progression at any time. Serum KL-6 concentration, alone or combined in a simple score with gender, allows an effective stratification of ILD patients for risk of disease progression at any time.
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Affiliation(s)
- Lutz B. Jehn
- Center for Interstitial and Rare Lung Disease, Department of Pneumology, Ruhrlandklinik University Hospital, University of Duisburg-Essen, 45239 Essen, Germany
| | - Ulrich Costabel
- Center for Interstitial and Rare Lung Disease, Department of Pneumology, Ruhrlandklinik University Hospital, University of Duisburg-Essen, 45239 Essen, Germany
| | - Eda Boerner
- Center for Interstitial and Rare Lung Disease, Department of Pneumology, Ruhrlandklinik University Hospital, University of Duisburg-Essen, 45239 Essen, Germany
| | - Julia Wälscher
- Center for Interstitial and Rare Lung Disease, Department of Pneumology, Ruhrlandklinik University Hospital, University of Duisburg-Essen, 45239 Essen, Germany
| | - Dirk Theegarten
- Institute of Pathology, University Hospital Essen, 45239 Essen, Germany
| | - Christian Taube
- Center for Interstitial and Rare Lung Disease, Department of Pneumology, Ruhrlandklinik University Hospital, University of Duisburg-Essen, 45239 Essen, Germany
| | - Francesco Bonella
- Center for Interstitial and Rare Lung Disease, Department of Pneumology, Ruhrlandklinik University Hospital, University of Duisburg-Essen, 45239 Essen, Germany
- Correspondence: ; Tel.: +49-201-433-4502; Fax: +49-201-433-4152
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Krebs von den Lungen-6 as Disease Severity Marker for COVID-19 Patients: Analytical Verification and Quality Assessment of the Tosoh AIA-360 Compared to Lumipulse G600II. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19042176. [PMID: 35206372 PMCID: PMC8872393 DOI: 10.3390/ijerph19042176] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/29/2022] [Accepted: 02/08/2022] [Indexed: 12/21/2022]
Abstract
Background: Krebs von den Lungen-6 (KL-6) has been proposed as a disease severity marker of COVID-19. All research articles reported the KL-6 assay detected through Fujirebio reagents by Lumipulse G600/G1200 instrument. In the present study, KL-6 assay was analysed through Tosoh AIA-360 and compared with analytical results by Lumipulse G600 in a population of COVID-19 patients. Materials and methods: Sixty-four patients (median age, IQR 67 (58–76) years), all hospitalized for COVID-19 interstitial pneumonia at Siena COVID Unit. KL-6 was measured by two methods, chemiluminescence enzyme immunoassay (CLEIA) and fluorescent enzyme immunoassay (FEIA) method by Lumipulse G600 II and AIA 360 systems, respectively. Results: KL-6 concentrations evaluated by Lumipulse G600II were significantly higher in severe than those in non-severe patients (p < 0.0001) as well as evaluating by AIA360 (p < 0.0001). Receiver operating curve (ROC) curve analysis showed that KL-6 concentrations, by Lumipuse G600II, distinguished severe from non-severe COVID-19 patients with an area under the curve (AUC) of 99.8% and the best cut-off value was 448 U/mL. AUROC between severe and non-severe COVID-19 patients using T0 KL-6 concentrations by AIA360 was 97.4% and the best cut-off value was 398 U/mL. According to T0 KL-6 concentrations in COVID-19 patients, Bland–Altman difference analysis revealed a mean bias of 78 ± 174.8; while using T1 KL-6 concentrations in COVID-19 patients, Bland–Altman difference analysis revealed a mean bias of 48 ± 126 (95% limits of agreement −199–295) between the Lumipulse G600 II and the AIA360 systems. Conclusions: In conclusion, our study demonstrated that CLEIA and FEIA methods for serum KL-6 detection are comparable and reliable. KL-6 was confirmed as an easily detectable and effective biomarker to identify severe COVID-19 patients.
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KL-6 in ANCA-Associated Vasculitis Patients with and without ILD: A Machine Learning Approach. BIOLOGY 2022; 11:biology11010094. [PMID: 35053092 PMCID: PMC8772774 DOI: 10.3390/biology11010094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/04/2022] [Accepted: 01/06/2022] [Indexed: 11/27/2022]
Abstract
Simple Summary Krebs von den Lungen-6 (KL-6) is a mucin involved in several cellular processes, and its expression increases following injured or regenerating type II pneumocyte. KL-6 was suggested to identify patients affected by fibrotic interstitial lung diseases (ILD) associated with rheumatologic disorders. This is the first study that has assessed whether serum KL-6 can distinguish ANCA-associated vasculitis (AAV) patients with ILD from those without ILD, and whether this biomarker and its changes over time are correlated with disease activity, vasculitic damage, and response to treatment. Thirteen AAV patients were enrolled, four of them with ILD. Higher serum KL-6 was found in AAV-ILD patients in comparison with those without ILD. The best KL-6 cutoff values of 368 U/mL and 301 U/mL at baseline and during follow-up, respectively, were suggested to distinguish the two groups. A direct correlation was found between serum KL-6 and disease activity. Our multicenter study demonstrated KL-6 as a reliable, non-invasive, and easy-to-perform marker of ILD in AAV patients, being helpful for disease activity assessment. Changes in serum concentrations of KL-6 over time could be useful for monitoring AAV patients. Further study of KL-6 as a marker of response to therapy during long-term follow-up would also be worthwhile. Abstract Background: ANCA-associated vasculitis (AAV) are small vessel vasculitis distinguished between microscopic polyangiitis (MPA) and granulomatosis with polyangiitis (GPA). The former may have interstitial lung disease (ILD) associated with high morbidity and mortality. Here, Krebs von den Lungen-6 (KL-6), a marker of fibrotic ILD, was assessed for distinguishing AAV patients with ILD from those without ILD, and whether its changes over time are correlated with disease activity. Materials and Methods: Thirteen AAV patients (eight females, mean age 61 ± 14.8 years) were enrolled: six MPA and six GPA. Serum samples were assayed for KL-6 concentrations (Fujirebio Europe, Belgium). To investigate potential binary classifiers for diagnosis of AAV-ILD, we constructed a regression decision tree model. Results: Higher serum KL-6 were in AAV-ILD compared with those without ILD (972.8 ± 398.5 vs 305.4 ± 93.9, p = 0.0040). Area under the receiver operating characteristics curve showed 100% of the diagnostic performance of KL-6 for identifying the ILD involvement (accuracy 91.7%) and the best cutoff value of 368 U/mL (sensitivity 100% and specificity 87.5%). The decision tree model showed a 33% improvement in class purity using a cut-off value of 513 U/mL to distinguish AAV patients with and without ILD. Stratifying AAV patients as MPA and GPA with and without ILD considering T0 and T1 KL-6, the model obtained an improvement of 40% for classifying GPA non-ILD with a T0 serum KL-6 cut-off value of 513 U/mL and a T1 KL-6 cut-off of 301 U/mL. A direct correlation was found between serum T0 KL-6 and T0 BVAS (r = 0.578, p = 0.044). Conclusion: Our multicenter study demonstrated KL-6 as a reliable, non-invasive, and easy-to-perform marker of ILD in AAV patients and its helpfulness for disease activity assessment. Changes in serum concentrations of KL-6 over time could be useful for monitoring AAV patients. Further study of KL-6 as a marker of response to therapy during long-term follow-up would also be worthwhile.
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Interstitial lung disease with myeloperoxidase-antineutrophil cytoplasmic antibody-associated vasculitis in elderly patients. Rheumatol Int 2021; 41:1641-1650. [PMID: 34056682 DOI: 10.1007/s00296-021-04891-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 05/14/2021] [Indexed: 11/27/2022]
Abstract
Anti-neutrophil cytoplasmic antibodies-associated vasculitis (AAV) occurs in elderly people, and patients with anti-myeloperoxidase autoantibodies (MPO-ANCA)-positive AAV are often complicated with interstitial lung disease (ILD). This study aimed to evaluate the age-related clinical features of elderly patients with MPO-ANCA-positive AAV-ILD. This study retrospectively investigated 63 patients with MPO-ANCA-positive AAV-ILD, all of whom were 65 years or older at diagnosis. Clinical characteristics, causes of death and survival rates among three groups stratified by age (65-74 years, n = 29; 75-79 years, n = 18; over 80 years, n = 16) were compared. This study also examined the association with severe infections in these patients. Among the three age groups, there were significant differences in sex (P = 0.032), serum Krebs von den Lungen-6 (P < 0.01), and total ground-glass opacity score (P = 0.011). The causes of death were mainly severe infections and complications of ILD. Kaplan-Meier curve analysis showed a significantly lower 5-year survival rate in the oldest group (P < 0.01). Regarding severe infections in these patients, the 5-year cumulative incidence of severe infections was higher in the patients receiving steroid pulse therapy (P = 0.034). The clinical characteristics of MPO-ANCA-positive AAV-ILD differ with age in elderly patients, with age being an important poor prognostic factor in these patients. The administration of steroid pulse therapy is a significant risk factor of severe infection in MPO-ANCA-positive elderly patients with AAV-ILD.
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Ji Y, Bourke SJ, Spears M, Wain LV, Boyd G, Lynch PP, Cunningham M, Boyd K, Donnelly I, Kohno N, McSharry C. Krebs von den Lungen-6 (KL-6) is a pathophysiological biomarker of early-stage acute hypersensitivity pneumonitis among pigeon fanciers. Clin Exp Allergy 2020; 50:1391-1399. [PMID: 32966647 DOI: 10.1111/cea.13744] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 08/10/2020] [Accepted: 08/31/2020] [Indexed: 01/01/2023]
Abstract
BACKGROUND Identifying early stages of hypersensitivity pneumonitis (HP) is hampered by variable presentation, heterogeneous or undetected causal antigens and lack of gold-standard biomarkers. Krebs von den Lungen (KL)-6 is pathophysiological biomarker of alveolar epithelial damage. Pigeon fanciers, susceptible to HP, provide a model to investigate early HP. OBJECTIVE To test the hypothesis that plasma concentrations of KL-6 are increased in early-stage acute HP. METHODS Clinical history, spirometry and blood samples were obtained from pigeon fanciers, 20 with intermittent acute symptoms indicative of developing HP, 27 with no symptoms and 10 healthy subjects with no avian exposure. Plasma KL-6 (units/mL) and pigeon antigen-specific IgG antibody were quantified by enzyme immunoassay. Blood lymphocytes were quantified by flow cytometry and antigen specificity by in vitro cytokine production. RESULTS KL-6 was higher in fanciers than controls, median (IQR) 452 (244, 632) vs 274 (151, 377), P = .01. Although fanciers with symptoms had similar antigen exposure and lung function, they had higher KL-6 than those without, 632 (468, 1314) vs 320 (200, 480), P < .001. KL-6 correlated with IgG antibody titre in those with symptoms, r = .591, P = .006. High KL-6, irrespective of symptom category, was associated with higher antibody (P = .006) and lymphocyte proliferation (P = .041), and lower CD4+ T lymphocyte proportion (P = .032). CONCLUSION AND CLINICAL RELEVANCE Raised KL-6 is associated with acute symptoms of early-stage HP, and its correlation with antibody may support therapeutic strategies when HP is suspected. KL-6 may act as a mechanistic biomarker of early pathogenesis by linking lung pathophysiological changes with an endotype of immune hypersensitivity.
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Affiliation(s)
- Yuan Ji
- Institute of Infection, Immunity and Inflammation, Glasgow University, Glasgow, UK
| | - Stephen J Bourke
- Department of Respiratory Medicine, Royal Victoria Infirmary, Newcastle upon Tyne, UK
| | - Mark Spears
- Department of Respiratory Medicine, Forth Valley Royal Hospital, Larbert, UK
| | - Louise V Wain
- Department of Health Sciences, University of Leicester, Leicester, UK.,National Institute for Health Research, Leicester Respiratory Biomedical Research Centre, Glenfield Hospital, Leicester, UK
| | - Gavin Boyd
- Department of Respiratory Medicine, Stobhill Hospital, Glasgow, UK
| | | | - Matthew Cunningham
- Institute of Infection, Immunity and Inflammation, Glasgow University, Glasgow, UK
| | | | - Iona Donnelly
- Institute of Infection, Immunity and Inflammation, Glasgow University, Glasgow, UK
| | | | - Charles McSharry
- Institute of Infection, Immunity and Inflammation, Glasgow University, Glasgow, UK
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Zhang H, Chen L, Wu L, Huang J, Li H, Wang X, Weng H. Diagnostic and prognostic predictive values of circulating KL-6 for interstitial lung disease: A PRISMA-compliant systematic review and meta-analysis. Medicine (Baltimore) 2020; 99:e19493. [PMID: 32311922 PMCID: PMC7220476 DOI: 10.1097/md.0000000000019493] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Past investigations showed inconsistent results for diagnostic and prognostic predictive values of Krebs von den Lungen-6 (KL-6) for interstitial lung disease (ILD). METHODS Web of Science and PubMed were systematically searched on for articles exploring the association of KL-6 and ILDs published between September 1993 and March 2019. For comparisons between-groups, the standard mean difference and 95% confidence intervals (CIs) were computed as the effect sizes. For diagnostic studies, a summary of sensitivity, specificity, positive likelihood ratios, negative likelihood ratios, and diagnostic odds ratio, which indicated the accuracy of KL-6 in the differentiation of ILDs and no ILDs, were calculated from the true positive, true negative, false positive, and false negative of each study. In addition, the summary receive-operating characteristics curve was constructed to summarize the TP and FP rates. For follow-up study, we computed hazard ratios (HRs) and 95% CIs for mortality. ILD patients showed elevated concentrations of KL-6, compared to healthy controls and patients without ILD. RESULTS The meta-analysis showed a sensitivity (0.85 [95% CI: 0.77-0.91]) and specificity (0.97 [95% CI: 0.90-0.99]) of KL-6 for ILDs. In addition, it showed elevated baseline circulating levels of KL-6 in subsequent active ILD, compared to subsequent inactive ILD. Moreover, there was a significant association between baseline levels of circulating KL-6 and mortality of ILD (HR 2.95, 95% CI 2.45-3.55, I = 65.9%, P = .032). CONCLUSION In conclusion, the study suggested that circulating KL-6 showed diagnostic and prognostic predictive values for ILDs.
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Takahashi F, Miura E, Shibukawa K, Chinda J, Miyokawa N, Imamoto C, Kikuchi K, Hasebe N. Monitoring with serum SP-A, SP-D, and KL-6 in a patient with interstitial pneumonia complicated with ANCA-associated glomerulonephritis. CEN Case Rep 2014; 3:5-9. [PMID: 28509235 DOI: 10.1007/s13730-013-0074-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 03/01/2013] [Indexed: 11/26/2022] Open
Abstract
A 69-year-old woman was admitted to hospital, complaining of fatigue and dry cough. Her renal function deteriorated rapidly, and the laboratory findings showed elevated myeloperoxidase-specific anti-neutrophil cytoplasmic antibody (ANCA). Renal biopsy examination revealed crescentic glomerulonephritis (pauci-immune type), and linear opacities and a honeycomb appearance in both lower lobes was evident on the chest computed tomography scan. The patient was diagnosed as having ANCA-associated glomerulonephritis complicated with mild interstitial pneumonia (IP). Treatment with methylprednisolone pulse therapy improved both her renal function and IP, but her lung lesions worsened during the course of tapering the prednisolone doses. After careful observation, her IP improved gradually without specific treatment. Worsening or improvement of her lung lesions was accompanied by changes in the serological markers of IP, namely, surfactant protein-A, surfactant protein-D, and KL-6. We found that monitoring these markers was helpful in diagnosing and managing IP in our patient with ANCA-associated vasculitis.
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Affiliation(s)
- Fumihiko Takahashi
- Cardiovascular, Respiratory and Neurology Division, Department of Internal Medicine, Asahikawa Medical University, Asahikawa, Japan.
- Department of Cardiovascular Medicine, Rumoi City Hospital, 2-16, Shinonome-cho, Rumoi, 077-8511, Japan.
| | - Eriko Miura
- Cardiovascular, Respiratory and Neurology Division, Department of Internal Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Kiyoko Shibukawa
- Cardiovascular, Respiratory and Neurology Division, Department of Internal Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Junko Chinda
- Cardiovascular, Respiratory and Neurology Division, Department of Internal Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Naoyuki Miyokawa
- Department of Surgical Pathology, Asahikawa Medical University, Asahikawa, Japan
| | | | - Kenjiro Kikuchi
- Cardiovascular, Respiratory and Neurology Division, Department of Internal Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Naoyuki Hasebe
- Cardiovascular, Respiratory and Neurology Division, Department of Internal Medicine, Asahikawa Medical University, Asahikawa, Japan
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Imai T, Takeda SI, Kawaguchi K, Chaki Y, Morishita Y, Akimoto T, Muto S, Kusano E. Delayed development of pulmonary hemorrhage in a patient with positive circulating anti-neutrophil cytoplasmic antibody: a clinical dilemma. CASE REPORTS IN NEPHROLOGY AND UROLOGY 2013; 3:121-7. [PMID: 24163688 PMCID: PMC3806712 DOI: 10.1159/000355509] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Detection of circulating anti-neutrophil cytoplasmic antibody (ANCA) provides a powerful clue in the diagnosis of vasculitis, but the clinical interpretation of the results is difficult in some cases. Here, we describe the case of a 65-year-old man who underwent hemodialysis due to focal segmental glomerulosclerosis and abruptly developed hemoptysis 14 years after a renal biopsy. At the time of the biopsy, computed tomography (CT) showed interstitial shadows in the lungs and pleural thickening, indicating pneumoconiosis that was accompanied by tuberculosis. Circulating myeloperoxidase-ANCA (10.5–32.5 U/ml) was subsequently noted, but the significance of this observation was unclear due to the preexisting disorders in the lungs and kidneys. Potent immunosuppressive therapies were avoided because of the pulmonary lesions and decreased renal function. There were few changes noted on follow-up CT, but infiltrative shadows emerged in the bilateral lungs, consistent with hemoptysis. The hemorrhagic shadows completely disappeared shortly after initiation of steroid therapy, with normalization of the serum ANCA level. Herein, we report this case, with an emphasis on the clinical dilemma faced in deciding the appropriate treatment. The findings in the case provide deep insights into clinical management of ANCA-positive patients.
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Affiliation(s)
- Toshimi Imai
- Department of Internal Medicine, Oyama Municipal Hospital, Oyama, Jichi Medical University, Shimotsuke, Japan ; Dialysis Center, Oyama Municipal Hospital, Oyama, Jichi Medical University, Shimotsuke, Japan ; Divison of Nephrology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan
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Xu L, Yang D, Zhu S, Gu J, Ding F, Bian W, Rong Z, Shen C. Bleomycin-induced pulmonary fibrosis is attenuated by an antibody against KL-6. Exp Lung Res 2013; 39:241-8. [DOI: 10.3109/01902148.2013.798056] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Doishita S, Inokuma S, Asashima H, Nakachi S, Matsuo Y, Rokutanda R, Kobayashi S, Hagiwara K, Satoh T, Akiyama O. Serum KL-6 level as an indicator of active or inactive interstitial pneumonitis associated with connective tissue diseases. Intern Med 2011; 50:2889-92. [PMID: 22129503 DOI: 10.2169/internalmedicine.50.5866] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
OBJECTIVE To elucidate the cut off levels of serum KL-6 indicating patients with interstitial pneumonitis (IP) and patients with active IP associated with connective tissue diseases (CTDs). METHODS CTD patients whose serum KL-6 level was measured were included. IP was diagnosed on the basis of medical records including XP/CT findings, and active IP was assumed in case that intervention for IP was newly added. The cut off levels were determined by receiver operating characteristic (ROC) curve analysis. RESULTS Among 240 (174 females) patients, 67 (42) had IP and 15 (9) had active IP. The ages of patients with and without IP, and with active IP and with inactive IP were 70.3±9.5 and 62.8±15.3, and 72.8±8.1 and 69.6±9.8, respectively. IP was significantly more prevalent in males and the elderly. The KL-6 levels were 990±90 and 301±12 U/mL in patients with and without IP, and 1,905±236 and 726±54 U/mL in those with active IP and with inactive IP, respectively. ROC curve analysis showed a cut off level of 509 U/mL for indicating IP, and that of 1,051-1,060 U/mL for indicating active IP. CONCLUSION A serum KL-6 level of higher than 500 U/mL is a marker of the presence of IP, and a level of higher than 1,000 U/mL is a marker of the presence of active IP associated with CTDs.
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Affiliation(s)
- Satoshi Doishita
- Department of Allergy and Rheumatic Diseases, Japanese Red Cross Medical Center, Japan
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Fujita S, Hirayama K, Ogawa Y, Shimohata H, Kobayashi M. Mizoribine reduces serum KL-6 levels in ANCA-associated vasculitis. Clin Exp Nephrol 2009; 14:203-4. [PMID: 19967424 DOI: 10.1007/s10157-009-0250-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Accepted: 11/11/2009] [Indexed: 11/29/2022]
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Kawakami T, Mizoguchi M, Saito R, Soma Y. Histopathological evidence of small-vessel vasculitis within the skin and lungs associated with interstitial pneumonia in an adult patient with dermatomyositis. Clin Exp Dermatol 2008; 33:415-7. [PMID: 18498411 DOI: 10.1111/j.1365-2230.2008.02729.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Dermatomyositis (DM) often has a poor prognosis, due to complications associated with malignancy or interstitial pneumonia (IP). It is uncommon to find histopathological small-vessel vasculitis within cutaneous lesions and pulmonary capillaritis in patients with DM. A 64-year-old woman was diagnosed with DM based on the presence of quadriparesis, typical heliotropic rash, Gottron's papules, increased serum levels of muscle enzymes and typical muscle biopsy findings. She also had associated IP, which subsequently developed into a rapidly progressive condition. We found a high titre of Krebs von den Lunge (KL)-6 in her serum. Measurement of serum KL-6 level is widely accepted as a diagnostic test to monitor the activity of interstitial lung diseases. Histopathological examinations of the cutaneous and lung-associated features showed small-vessel vasculitis. We suggest that investigation of KL-6 levels in patients with DM and associated conditions should be carried out to determine if raised KL-6 levels are useful at predicting outcome or severity of various features.
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Affiliation(s)
- T Kawakami
- Department of Dermatology, St. Marianna University School of Medicine, Japan. tami@marianna-uacjp
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Matsuno Y, Satoh H, Ishikawa H, Kodama T, Ohtsuka M, Sekizawa K. Simultaneous measurements of KL-6 and SP-D in patients undergoing thoracic radiotherapy. Med Oncol 2006; 23:75-82. [PMID: 16645232 DOI: 10.1385/mo:23:1:75] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2005] [Revised: 11/30/1999] [Accepted: 04/22/2005] [Indexed: 11/11/2022]
Abstract
PURPOSE Radiation pneumonitis (RP) is a serious complication in patients undergoing thoracic radiotherapy (TRT). Serum KL-6 and SP-D have been shown to increase in several kinds of interstitial pneumonia. To evaluate their clinical usefulness in detecting RP, we serially measured them in patients receiving TRT. MATERIALS AND METHODS Thirty-nine patients, who received TRT for lung cancer between July 1999 and April 2004, were prospectively studied. Serum levels of KL-6 and SP-D were measured using enzyme-linked immunosorbent assays. Patients were followed up until August 2004 or their deaths. RESULTS During the period, RP occurred in 19 patients. In five patients with diffuse RP extended outside the radiation field, serum KL-6 levels increased, reaching more than 1,000 U/mL. Serum KL-6 levels at 40 Gy in patients who developed RP were higher than those without it (p = 0.0363, Mann-Whitney U test). In addition, serum KL-6 levels at 40 Gy in patients who developed RP were higher than those of pretreatment (p = 0.0126, Wilcoxon signed rank test). On the other hand, there were no statistical differences between sp-d at 40 Gy and those before TRT (P = 0.1165). CONCLUSIONS Increased KL-6 at 40 Gy compared with those before treatment in patients undergoing TRT may be of clinical significance. KL-6 proved to be a useful indicator for estimating RP, while usefulness of SP-D was not confirmed in this study.
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Affiliation(s)
- Yosuke Matsuno
- Division of Respiratory Medicine, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan.
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