Immune Checkpoint Inhibitor-Related Pneumonitis in Lung Cancer Patients with Interstitial Lung Disease: Significance of Radiological Pleuroparenchymal Fibroelastosis.

INTRODUCTION: Pleuroparenchymal fibroelastosis (PPFE) findings are associated with poor prognosis in interstitial lung disease (ILD). However, the effect of PPFE findings on the development of immune checkpoint inhibitor-related pneumonitis (ICI-pneumonitis), a life-threatening adverse event, in lung cancer patients with ILD has not been elucidated. We aimed to determine whether PPFE findings are a risk factor for ICI-pneumonitis in lung cancer patients with ILD. METHODS: We retrospectively examined 712 lung cancer patients, including 173 patients with background ILDs, who received ICI therapy in our institute between December 2015 and May 2021. Background ILDs were radiologically classified into three types: lone PPFE, other ILDs with PPFE, and other ILDs without PPFE. The cumulative ICI-pneumonitis incidence curves and median overall survival (mOS) were compared between the three radiological types, and risk factors for ICI-pneumonitis were evaluated. RESULTS: Of 173 eligible patients with ILD, 23 patients (13.3%) experienced ICI-pneumonitis. The Kaplan-Meier method and the log-rank test showed that lone PPFE patients had significantly lower incidence of ICI-pneumonitis (p = 0.024) and longer mOS (575 vs. 326 days; p = 0.0096) than other ILDs patients. ICI-pneumonitis (p = 0.35) and mOS (p = 0.29) were not significantly different between other ILDs with and without PPFE. A multivariate Cox proportional hazards regression analysis revealed that lone PPFE pattern was an independent predictive factor for ICI-pneumonitis (hazard ratio, 0.20; 95% confidence interval, 0.043-0.93; p = 0.040). CONCLUSION: ICI therapy could be safer in lone PPFE patients than in other ILDs patients with lung cancer.

Quantitative Evaluation of Changes in Three-Dimensional CT Density Distributions in Pulmonary Alveolar Proteinosis after GM-CSF Inhalation.

BACKGROUND: A previous clinical trial for autoimmune pulmonary alveolar proteinosis (APAP) demonstrated that granulocyte-macrophage colony-stimulating factor (GM-CSF) inhalation reduced the mean density of the lung field on computed tomography (CT) across 18 axial slice planes at a two-dimensional level. In contrast, in this study, we challenged three-dimensional analysis for changes in CT density distribution using the same datasets. METHODS: As a sub-study of the trial, CT data of 31 and 27 patients who received GM-CSF and placebo, respectively, were analyzed. To overcome the difference between various shooting conditions, a newly developed automatic lung field segmentation algorithm was applied to CT data to extract the whole lung volume, and the accuracy of the segmentation was evaluated by five pulmonary physicians independently. For normalization, the percent pixel (PP) in a certain density range was calculated as a percentage of the total number of pixels from -1,000 to 0 HU. RESULTS: The automatically segmented images revealed that the lung field was accurately extracted except for 7 patients with minor deletion or addition. Using the change in PP from baseline to week 25 (ΔPP) as the vertical axis, we created a histogram with 143 HU bins set for each patient. The most significant difference in ΔPP between GM-CSF and placebo groups was observed in two ranges: from -1,000 to -857 and -143 to 0 HU. CONCLUSION: Whole lung extraction followed by density histogram analysis of ΔPP may be an appropriate evaluation method for assessing CT improvement in APAP.

Cases of severe Mycobacterium avium lung disease occurred in a married couple caused by identical strain.

Bacteria of the Mycobacterium avium complex, which are environmental organisms found in soil and water, have been found to cause human lung diseases. Although infection is reported to occur in cohabiting patients, the incidence of infection from the single clone remains rarely documented. Herein, we report a case of M. avium lung disease caused by specimens with the same clone strains in a married couple. The wife, a 67-year-old female, had severe M. avium lung disease despite receiving multidrug chemotherapy for eleven years. The husband, a 68-year-old male, died of acute lung injury complicated by M. avium pleurisy. The result of the variable-number tandem-repeat analysis of isolates from serial sputum specimens of both patients indicated that the severe M. avium lung disease in a married couple was caused by the isolates with identical pattern. This case were considered to have acquired clarithromycin resistance during each clinical course, revealing the possibility of infection with a strain that may induce severe pulmonary condition.

Inhaled GM-CSF for Pulmonary Alveolar Proteinosis.

BACKGROUND: Pulmonary alveolar proteinosis is a disease characterized by abnormal accumulation of surfactant in the alveoli. Most cases are autoimmune and are associated with an autoantibody against granulocyte-macrophage colony-stimulating factor (GM-CSF) that prevents clearing of pulmonary surfactant by alveolar macrophages. An open-label, phase 2 study showed some therapeutic efficacy of inhaled recombinant human GM-CSF in patients with severe pulmonary alveolar proteinosis; however, the efficacy in patients with mild-to-moderate disease remains unclear. METHODS: We conducted a double-blind, placebo-controlled trial of daily inhaled recombinant human GM-CSF (sargramostim), at a dose of 125 µg twice daily for 7 days, every other week for 24 weeks, or placebo in 64 patients with autoimmune pulmonary alveolar proteinosis who had a partial pressure of arterial oxygen (Pao2) while breathing ambient air of less than 70 mm Hg (or <75 mm Hg in symptomatic patients). Patients with severe pulmonary alveolar proteinosis (Pao2 <50 mm Hg) were excluded to avoid possible exacerbation of the disease in patients who were assigned to receive placebo. The primary end point was the change in the alveolar-arterial oxygen gradient between baseline and week 25. RESULTS: The change in the mean (±SD) alveolar-arterial oxygen gradient was significantly better in the GM-CSF group (33 patients) than in the placebo group (30 patients) (mean change from baseline, -4.50±9.03 mm Hg vs. 0.17±10.50 mm Hg; P = 0.02). The change between baseline and week 25 in the density of the lung field on computed tomography was also better in the GM-CSF group (between-group difference, -36.08 Hounsfield units; 95% confidence interval, -61.58 to -6.99, calculated with the use of the Mann-Whitney U test and the Hodges-Lehmann estimate of confidence intervals for pseudo-medians). Serious adverse events developed in 6 patients in the GM-CSF group and in 3 patients in the placebo group. CONCLUSIONS: In this randomized, controlled trial, inhaled recombinant human GM-CSF was associated with a modest salutary effect on the laboratory outcome of arterial oxygen tension, and no clinical benefits were noted. (Funded by the Japan Agency for Medical Research and Development and the Ministry of Health, Labor, and Welfare of Japan; PAGE ClinicalTrials.gov number, NCT02835742; Japan Medical Association Center for Clinical Trials number, JMA-IIA00205.).

Finding a novel QTL responsible for kernel cracking resistance from CSSLs of 'Itadaki' (O. sativa L.) × donor O. rufipogon.

To find new QTLs responsible for kernel cracking resistance, we screened 50 CSSLs derived from the moderately resistant cultivar 'Itadaki' (O. sativa L.) and the donor O. rufipogon. Two lines, IRSL 30 and IRSL 37, were selected as resistant. QTL analyses of the percentage of cracked kernels (PCK) in F4 individuals derived from "Itadaki/IRSL 30" and "Itadaki/IRSL 37" identified a major QTL, qCR (Cracking Resistance) 8-2, at the same position on chromosome 8 in both populations. 'IRSL 30' and 'IRSL 37' had a reduced PCK. These results show that qCR8-2 is likely to be an important QTL for kernel cracking resistance. Both lines had long awns, linked to qCR8-2, but the awnless line 'Chukei 19301' was also derived from "Itadaki/IRSL 37", so qCR8-2 is distinct from the gene for awn development. We consider that qCR8-2 will help in the breeding of new rice cultivars with high cracking resistance and in elucidating the physiological mechanism of kernel cracking.

Recombinant thrombomodulin for acute exacerbation in idiopathic interstitial pneumonias.

BACKGROUND AND OBJECTIVE: Acute exacerbation (AE) in idiopathic pulmonary fibrosis (IPF) or other idiopathic interstitial pneumonias (IIP) is a poor prognostic event despite conventional therapy with corticosteroids and/or immunosuppressants. We aimed to evaluate the efficacy and safety of recombinant human soluble thrombomodulin (rhTM) for AE-IIP. METHODS: For this prospective single-arm open-label multicentre cohort study, we retrospectively registered 61 cases of AE-IIP treated with conventional therapy between 2011 and 2013 (control arm), and prospectively enrolled 39 cases of AE-IIP treated with conventional therapy and rhTM (380 U/kg/day for 6 days) between 2014 and 2016 (rhTM arm). To reduce potential confounding in treatment comparisons, an adjusted mortality analysis for 90-day survival was conducted with weighted Cox proportional hazards regression models using inverse probability of treatment weighting. Weights were derived from propensity scores estimated using a multivariable logistic regression analysis including potential confounders. RESULTS: The 90-day survival rates of AE-IIP patients treated with/without rhTM were 66.7% (26/39) and 47.5% (29/61), respectively. After adjusting for imbalances, rhTM therapy was significantly associated with reduced mortality (adjusted hazard ratio (HR): 0.453; 95% CI: 0.237-0.864; P = 0.0163). The frequencies of adverse events with/without rhTM were 17.9% (7/39) and 19.7% (12/61), which were similar in both arms (P = 1.0). Two bleeding-related adverse events occurred in the rhTM arm. CONCLUSION: Safety and efficacy were observed for rhTM treatment of AE-IIP. A future randomized controlled trial is required to draw final conclusions.

Efficacy and safety of transbronchial lung biopsy for the diagnosis of lymphangioleiomyomatosis: A report of 24 consecutive patients.

BACKGROUND AND OBJECTIVE: Lymphangioleiomyomatosis (LAM) is a diffuse cystic lung disease that occurs in women of childbearing age. LAM can be diagnosed on a clinical basis in patients with typical high-resolution computed tomography (HRCT) patterns and at least one other corroborating disease feature, such as chylothorax, angiomyolipoma, tuberous sclerosis complex or elevated serum vascular endothelial growth factor (VEGF)-D. However, patients who do not meet these criteria require tissue confirmation for a definitive diagnosis, and the utility of methods that are less invasive than surgical lung biopsy, such as transbronchial lung biopsy (TBLB), are not well studied. We retrospectively studied the efficacy and safety of TBLB for the diagnosis of LAM. METHODS: From January 1991 to August 2015, 131 consecutive LAM patients were prospectively registered in our study, and a TBLB was conducted for 24 patients. We retrospectively studied the yield and safety of TBLB in this cohort. RESULTS: All 24 patients were women; the median age was 42 years. HRCT showed multiple round thin-walled cysts diffusely scattered throughout the lungs. The median level of serum VEGF-D was 2109 pg/mL. Characteristic pathological findings for LAM were identified in 17 patients (70.8%) by two expert pathologists. The %predicted value for diffusing capacity of carbon monoxide was significantly lower in the 17 TBLB-positive LAM patients compared to the seven TBLB-negative LAM patients (P = 0.046). There were no serious adverse events such as pneumothorax or uncontrollable bleeding due to TBLB. CONCLUSION: TBLB is a safe and effective method for the pathological diagnosis of LAM.

Risk factors for stomatitis in patients with lymphangioleiomyomatosis during treatment with sirolimus: A multicenter investigator-initiated prospective study.

PURPOSE: Lymphangioleiomyomatosis is a rare lung disease caused by proliferation of abnormal smooth muscle-like cells and typically occurs in premenopausal women. Sirolimus is now the first-line drug for the treatment of lymphangioleiomyomatosis. Sirolimus-induced stomatitis is the most frequent adverse event experienced during treatment. To identify risk factors, we investigated the association of stomatitis incidence with patient background data and treatment parameters, using data from the multicenter long-term sirolimus trial. METHODS: Subjects received sirolimus for 2 years at doses adjusted to maintain a trough blood level of 5 to 15 ng/mL. The incidence of stomatitis was correlated with baseline demographics, clinical characteristics, and changes in the longitudinal data. Risk factors at baseline were assessed by using univariate and multivariate analyses. RESULTS: The most frequent adverse event was stomatitis, with the cumulative rate reaching 88.9% by 9 months, higher than that reported in postrenal transplant patients. The repetition, the duration, and the severity of stomatitis events were variable among patients. We found that patients with low hemoglobin (Hb) (<14.5 g/dL) showed significantly higher incidence than those with high Hb (≥14.5 g/dL, P < .01). The cumulative rate for stomatitis incidence was significantly associated with a decrease in the mean corpuscular volume, while the Hb level was constant; thus, red blood cell count in patients increased during the study. CONCLUSIONS: Baseline Hb levels and a decrease in mean corpuscular volume during treatment were correlated with the incidence of stomatitis.

High-dose prednisolone after intravenous methylprednisolone improves prognosis of acute exacerbation in idiopathic interstitial pneumonias.

BACKGROUND AND OBJECTIVE: Acute exacerbation (AE) of idiopathic pulmonary fibrosis (IPF) (AE-IPF) is a poor prognostic disorder. AE is also reported to occur in other idiopathic interstitial pneumonias (IIPs). There are limited data available regarding the effectiveness of treatment for AE-IIPs. The objective of this study was to clarify the prognostic impact of the initial dose of prednisolone (PSL) for treating AE-IIPs. METHODS: Eighty-five patients with AE-IIPs, diagnosed according to the criteria of the Japanese Respiratory Society, were enrolled in this study (IPF/non-IPF: 63/22 patients) from 2004 to 2013. We performed multivariate Cox proportional hazard regression analysis to identify poor prognostic factors. HRCT patterns at the onset of AE-IIPs were classified as diffuse or non-diffuse. We evaluated the prognostic significance of the initial dose of PSL by adjusting for other prognostic factors. RESULTS: Median survival time (MST) after AE-IIPs diagnosis was 49 days. MST of AE-IPF and AE-non-IPF was 39 and 49 days, respectively. A diffuse HRCT pattern, lower serum IgG and higher serum surfactant protein-D at AE diagnosis, long-term oxygen therapy (LTOT) before AE and positive pressure ventilation (PPV) use for AE were significant poor prognostic factors for all patients, as were LTOT before AE and lower serum IgG for no-PPV patients. High-dose PSL ≥ 0.6 mg/kg was a significant prognostic factor for no-PPV patients after adjusting for other prognostic factors. CONCLUSION: We concluded that a dose of PSL ≥ 0.6 mg/kg after i.v. high-dose methylprednisolone therapy should be recommended for the treatment of AE-IIPs.

Pulmonary Fibrosis on High-Resolution CT of Patients With Pulmonary Alveolar Proteinosis.

OBJECTIVE: The CT findings of pulmonary fibrosis in patients with pulmonary alveolar proteinosis (PAP) are not yet well defined. The objective of this study was to evaluate the CT findings of PAP with a focus on pulmonary fibrosis secondary to PAP. MATERIALS AND METHODS: High-resolution CT (HRCT) scans of 44 patients with PAP were evaluated retrospectively with a focus on pulmonary fibrosis: 33 patients had autoimmune PAP, and 11 patients had secondary PAP. The intervals between the initial and last CT examinations ranged from 1 to 284 months (median, 60 months). The HRCT images were assessed by two chest radiologists independently; when the two radiologists disagreed, a final decision was made by consensus. RESULTS: A crazy-paving pattern was a more common HRCT finding in patients with autoimmune PAP than in those with secondary PAP. Traction bronchiectasis was found in four patients (9%) on the initial scans and in 10 patients (23%) on the last scans. There was no honeycombing on the initial scans. Honeycombing developed in two patients (5%): It was detected on 2-year follow-up in one patient and on 6-year follow-up in the other patient. Among the patients with autoimmune PAP, those with fibrosis detected on HRCT during follow-up had a worse prognosis than those without fibrosis detected on HRCT (p = 0.041). CONCLUSION: Fibrosis develops in approximately 20% of patients with PAP. The CT findings of parenchymal fibrosis suggest a poor outcome.

Heterogeneity of incidence and outcome of acute exacerbation in idiopathic interstitial pneumonia.

BACKGROUND AND OBJECTIVE: Acute exacerbations (AEs) of idiopathic pulmonary fibrosis (IPF) and other idiopathic interstitial pneumonia (IIP) have a poor prognosis. This study aims to clarify the incidence and prognosis of AE in IPF and the other IIP. METHODS: A total of 229 patients were enrolled, of whom 92 had IPF and 137 had 'IIP other than IPF' based on the American Thoracic Society/European Respiratory Society/Japanese Respiratory Society/Latin American Thoracic Association (ATS/ERS/JRS/ALAT) 2011 IPF Guidelines. IIP other than IPF included 11 patients with a surgical lung biopsy (SLB) and the remainder without such a biopsy. IIP other than IPF was further classified into IIP with a 'possible usual interstitial pneumonia (UIP)' pattern on HRCT (n = 75) and IIP with 'inconsistent with UIP' pattern (n = 62) based on published guidelines. Predictors of AE and the prognosis after AE were examined in these groups. RESULTS: The 1-year incidence of AE in IPF, IIP with possible UIP HRCT patterns and IIP with inconsistent with UIP HRCT patterns was 16.5%, 8.9% and 4.0%, respectively. AE occurred significantly more frequently in IPF than in IIP with possible UIP and inconsistent with UIP HRCT patterns after adjustment for BMI, modified Medical Research Council score and %forced vital capacity. Prognosis of AE-IIP with possible UIP HRCT pattern was significantly worse than that of AE-IPF. CONCLUSION: Although AE occurred significantly less frequently in IIP with possible UIP and inconsistent with UIP HRCT patterns than in IPF, the prognosis of AE-IIP with possible UIP HRCT patterns might be worse than that of AE-IPF.

Clinical Impact of Emphysema Evaluated by High-Resolution Computed Tomography on Idiopathic Pulmonary Fibrosis Diagnosed by Surgical Lung Biopsy.

BACKGROUND: The prognosis of combined cases of pulmonary fibrosis and emphysema is unresolved partially because radiological differentiation between usual interstitial pneumonia and nonspecific interstitial pneumonia is difficult in coexisting emphysema cases. OBJECTIVE: The purpose of this study was to clarify the clinical impact of emphysema on the survival of patients with idiopathic pulmonary fibrosis (IPF). METHODS: One hundred and seven patients with interstitial lung diseases were diagnosed by surgical lung biopsies between 2006 and 2012, and 47 patients were diagnosed with IPF through multidisciplinary discussion. Emphysema on high-resolution computed tomography scans was evaluated semiquantitatively by visual scoring. RESULTS: Eight out of the 47 IPF patients showed a higher emphysema score (>3) and were diagnosed to have IPF-emphysema. The median survival time of patients with IPF-emphysema (1,734 days) from the initial diagnosis was significantly shorter than that of patients with IPF alone (2,229 days) by Kaplan-Meier analysis (p = 0.007, log-rank test). Univariate Cox proportional hazard regression analyses revealed that a higher total emphysema score (>3.0) was a significantly poor prognostic factor in addition to Krebs von den Lungen-6, surfactant protein-D, arterial oxygen tension, percent forced vital capacity, and percent diffusing capacity of carbon monoxide (%DLCO). Multivariate Cox proportional hazard regression analyses with the stepwise method showed that higher total emphysema score (>3) and %DLCO were significantly poor prognostic factors. CONCLUSIONS: The prognosis of IPF-emphysema was significantly worse than that of IPF alone.

A mathematical model to predict protein wash out kinetics during whole-lung lavage in autoimmune pulmonary alveolar proteinosis.

Whole-lung lavage (WLL) remains the standard therapy for pulmonary alveolar proteinosis (PAP), a process in which accumulated surfactants are washed out of the lung with 0.5-2.0 l of saline aliquots for 10-30 wash cycles. The method has been established empirically. In contrast, the kinetics of protein transfer into the lavage fluid has not been fully evaluated either theoretically or practically. Seventeen lungs from patients with autoimmune PAP underwent WLL. We made accurate timetables for each stage of WLL, namely, instilling, retaining, draining, and preparing. Subsequently, we measured the volumes of both instilled saline and drained lavage fluid, as well as the concentrations of proteins in the drained lavage fluid. We also proposed a mathematical model of protein transfer into the lavage fluid in which time is a single variable as the protein moves in response to the simple diffusion. The measured concentrations of IgG, transferrin, albumin, and ß2-microglobulin closely matched the corresponding theoretical values calculated through differential equations. Coefficients for transfer of ß2-microglobulin from the blood to the lavage fluid were two orders of magnitude higher than those of IgG, transferrin, and albumin. Simulations using the mathematical model showed that the cumulative amount of eliminated protein was not affected by the duration of each cycle but dependent mostly on the total time of lavage and partially on the volume instilled. Although physicians have paid little attention to the transfer of substances from the lung to lavage fluid, WLL seems to be a procedure that follows a diffusion-based mathematical model.

Outcome of corticosteroid administration in autoimmune pulmonary alveolar proteinosis: a retrospective cohort study.

BACKGROUND: Although no report has demonstrated the efficacy of corticosteroid therapy for autoimmune pulmonary alveolar proteinosis (aPAP), we sometimes encounter patients who have received this therapy for various reasons. However, as corticosteroids can suppress alveolar macrophage function, corticosteroid therapy might worsen disease severity and increase the risk of infections. METHODS: For this retrospective cohort study, we sent a screening form to 165 institutions asking for information on aPAP patients treated with corticosteroids. Of the resulting 45 patients screened, 31 were enrolled in this study. We collected demographic data and information about corticosteroid treatment period, dose, disease severity score (DSS) over the treatment period, and complications. RESULTS: DSS deteriorated during corticosteroid therapy in 23 cases (74.1 %) and the estimated overall cumulative worsening rate was 80.8 % for the total observation period. The worsening rate was significantly higher in patients treated with high-dose prednisolone (>18.9 mg/day, n = 16) than treated with low-dose prednisolone (≤18.9 mg/day, n = 15) divided by median daily dose (p < 0.02). Of patients with worsening, one died of disseminated aspergillosis and another of respiratory failure. Infections newly emerged in 6 cases during corticosteroid therapy (p < 0.05). Median serum granulocyte/macrophage colony-stimulating factor (GM-CSF) autoantibody levels were similar to previously reported data in a large cohort study. CONCLUSION: The results demonstrate that corticosteroid therapy may worsen DSS of aPAP, increasing the risk for infections.

CYFRA 21-1 as a disease severity marker for autoimmune pulmonary alveolar proteinosis.

BACKGROUND AND OBJECTIVE: Serum markers, including Krebs von den Lungen (KL-6), surfactant protein (SP)-D, SP-A and carcinoembryonic antigen (CEA), are reported to reflect autoimmune pulmonary alveolar proteinosis (APAP) disease severity. We evaluated serum CYFRA21-1 levels as a marker of APAP. METHODS: In addition to KL-6, SP-D and CEA, we prospectively measured serum CYFRA 21-1 levels in 48 patients with APAP, consecutively diagnosed between 2002 and 2010. Diagnostic usefulness of CYFRA 21-1 was determined from 68 patients with interstitial lung diseases by receiver operator characteristic curve analysis. We evaluated the association between these serum markers and other disease severity markers, including pulmonary function parameters, alveolar-arterial oxygen gradient, British Medical Research Council score reflecting shortness of breath, and disease severity score. CYFRA 21-1 localization in the lung was examined by immunohistochemistry. RESULTS: Receiver operator characteristic curve demonstrated that CYFRA 21-1 effectively identified APAP. Serum CYFRA 21-1 levels at diagnosis were significantly associated with the measured disease severity parameters. Following whole lung lavage (n = 10) and granulocyte-macrophage colony-stimulating factor (GM-CSF) inhalation (n = 20), serum CYFRA 21-1 levels were significantly decreased. Responders (n = 11) to GM-CSF inhalation revealed significantly higher serum CYFRA 21-1 levels than non-responders (n = 9). Serum CYFRA 21-1 appeared to be a significant predictor of effectiveness of GM-CSF based on regression analysis. Immunohistochemistry showed that CYFRA 21-1 was localized on hyperplastic alveolar type II cells and lipoproteinaceous substances in alveoli. CONCLUSIONS: Serum CYFRA 21-1 is a sensitive and useful serum marker for diagnosis and evaluation of disease severity of APAP, and may predict the response to GM-CSF inhalation.

Utility of expiratory thin-section CT for fibrotic interstitial pneumonia.

BACKGROUND: Collagen vascular disease-associated interstitial lung disease (CVD-ILD) must be differentiated from idiopathic pulmonary fibrosis (IPF) since prognosis and treatment strategies differ between these two conditions. However, differentiating between CVD-ILD and IPF is often difficult. PURPOSE: To examine the utility of expiratory high-resolution computed tomography (HRCT) for differentiating between CVD-ILD and IPF. MATERIAL AND METHODS: Seventy patients were examined with expiratory and inspiratory HRCT with CVD-ILD (n = 36) or IPF (n = 34). Associated diagnoses in patients with CVD-ILD were rheumatoid arthritis (n = 22), Sjögren syndrome (n = 3), scleroderma (n = 2), polymyositis/dermatomyositis (n = 1), and unspecified connective tissue disease (n = 8). Parenchymal abnormalities on inspiratory HRCT and visual extent of air trapping on expiratory HRCT were evaluated, statistical differences in HRCT findings between the two conditions were determined, and air trapping CT scores were correlated with the results of pulmonary function testing. RESULTS: Air trapping was found in 27 (75%) of 36 cases of CVD-ILD and four (12%) of 34 cases of IPF. Seventeen of the 27 cases for which air trapping was exhibited with CVD-ILD were diagnosed with rheumatoid arthritis. A significant difference in frequency of air trapping was seen between CVD-ILD and IPF (P < 0.0001). Frequency of centrilobular nodules was significantly higher in CVD-ILD than in IPF (P = 0.021). In contrast, frequencies of interlobular interstitial thickening and traction bronchiectasis were significantly higher in IPF than in CVD-ILD (P = 0.005, P = 0.007, respectively). Correlations were seen between visual extent of air trapping and pulmonary function test results such as air trapping index (P = 0.004, r = 0.34), closing volume/vital capacity (P = 0.0002, r = -0.47), and closing capacity/total lung capacity (P < 0.0001, r = -0.51). CONCLUSION: The presence of air trapping on expiratory HRCT suggests CVD-ILD rather than IPF.

Cryptogenic organizing pneumonia: clinical outcomes of 60 consecutive cases.

Background: Cryptogenic organizing pneumonia (COP) improves rapidly following corticosteroid treatment; however, relapse is common. Therefore, this retrospective observational study aimed to clarify the clinical outcomes of COP and identify the predictive factors for relapse. Methods: The laboratory findings, pulmonary function test results, computed tomography (CT) findings, and clinical outcomes of 60 consecutive COP patients treated at our institution between 2007 and 2013 were retrospectively reviewed. The clinical characteristics of COP patients who did and did not show improvement were compared to identify the predictive factors for relapse in patients showing improvement. Results: Forty-one patients showed improvement without relapsing (Group 1), whereas thirteen relapsed after showing improvement (Group 2). Six patients did not show any improvement (Group 3). The serum Krebs von den Lungen-6 (KL-6) levels in Group 3 were greater than those in Groups 1 and 2 (P=0.004). The incidence of traction bronchiectasis and reticular opacities in Group 3 was higher than that in Groups 1 and 2 (P=0.048 and P=0.006, respectively). The cut-off levels of C-reactive protein (CRP), blood neutrophil fraction (%neutrophils) and lymphocyte fraction (%lymphocytes) for predicting relapse were 6.84 mg/dL, 68.7% and 14.1% in Groups 1 and 2, respectively. The log-rank test revealed that high serum CRP levels (P<0.001), high %neutrophils (P=0.003) and low %lymphocytes (P=0.006) showed significant correlations with a shorter time to the first relapse episode. Conclusions: Chest CT findings depicting pulmonary fibrosis and high serum KL-6 levels were correlated with the non-improvement of COP. Blood test results indicating inflammatory reactions were correlated with relapse in patients with COP showing improvement.

Light chain (κ/λ) ratio of GM-CSF autoantibodies is associated with disease severity in autoimmune pulmonary alveolar proteinosis.

Previous studies demonstrated that antigranulocyte colony-stimulating factor autoantibody (GMAb) was consistently present in patients with autoimmune pulmonary alveolar proteinosis (aPAP), and, thus, represented candidature as a reliable diagnostic marker. However, our large cohort study suggested that the concentration of this antibody was not correlated with disease severity in patients. We found that the κ/λ ratio of GMAb was significantly correlated with the degree of hypoxemia. The proportion of λ-type GMAb per total λ-type IgG was significantly higher in severely affected patients than those in mildly affected patients, but the proportion of κ-type was unchanged. The κ/λ ratio was significantly correlated with both KL-6 and SP-D, which have been previously reported as disease severity markers. Thus, the light chain isotype usage of GMAb may not only be associated with the severity of aPAP, but may also represent a useful disease severity marker.