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      Mycophenolate therapy in interstitial pneumonia with autoimmune features: a cohort study

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          Abstract

          Objectives

          International experts recently characterized interstitial pneumonia with autoimmune features (IPAF) as a provisional diagnosis for patients with interstitial lung disease who have characteristics of autoimmune disease but do not meet criteria for a specific autoimmune disease. We describe clinical characteristics of IPAF patients and examine responses to mycophenolate as a therapy for IPAF.

          Methods

          This retrospective cohort included adult patients meeting European Respiratory Society/American Thoracic Society classification criteria for IPAF. Sociodemographic, clinical, and pulmonary function test data were abstracted for patients with and without mycophenolate treatment and followed longitudinally from interstitial lung disease diagnosis for change in pulmonary function test results.

          Results

          We identified 52 patients who met criteria for IPAF. Of 52 IPAF patients, 24 did not receive mycophenolate and 28 did, with median time to mycophenolate treatment 22 months. Changes in FVC% and percentage predicted lung diffusion capacity for carbon monoxide (D LCO%) between the mycophenolate-treated and untreated groups were not significantly different (FVC% change P=0.08, D LCO% change P=0.17). However, there was a trend toward more rapid baseline decline of both FVC% and D LCO% in the mycophenolate-treated cohort before vs after mycophenolate therapy. The slope of both FVC% and D LCO% values improved after onset of mycophenolate exposure for the treated group, although this finding was not statistically significant.

          Conclusion

          Patients with IPAF might benefit from mycophenolate therapy. Larger prospective clinical trials are needed to evaluate the efficacy of mycophenolate for patients who meet criteria for IPAF.

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          Most cited references 13

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          A multidimensional index and staging system for idiopathic pulmonary fibrosis.

          Idiopathic pulmonary fibrosis (IPF) is a progressive fibrotic lung disease with an overall poor prognosis. A simple-to-use staging system for IPF may improve prognostication, help guide management, and facilitate research. To develop a multidimensional prognostic staging system for IPF by using commonly measured clinical and physiologic variables. A clinical prediction model was developed and validated by using retrospective data from 3 large, geographically distinct cohorts. Interstitial lung disease referral centers in California, Minnesota, and Italy. 228 patients with IPF at the University of California, San Francisco (derivation cohort), and 330 patients at the Mayo Clinic and Morgagni-Pierantoni Hospital (validation cohort). The primary outcome was mortality, treating transplantation as a competing risk. Model discrimination was assessed by the c-index, and calibration was assessed by comparing predicted and observed cumulative mortality at 1, 2, and 3 years. Four variables were included in the final model: gender (G), age (A), and 2 lung physiology variables (P) (FVC and Dlco). A model using continuous predictors (GAP calculator) and a simple point-scoring system (GAP index) performed similarly in derivation (c-index of 70.8 and 69.3, respectively) and validation (c-index of 69.1 and 68.7, respectively). Three stages (stages I, II, and III) were identified based on the GAP index with 1-year mortality of 6%, 16%, and 39%, respectively. The GAP models performed similarly in pooled follow-up visits (c-index ≥71.9). Patients were drawn from academic centers and analyzed retrospectively. The GAP models use commonly measured clinical and physiologic variables to predict mortality in patients with IPF.
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            Predicting survival across chronic interstitial lung disease: the ILD-GAP model.

            Risk prediction is challenging in chronic interstitial lung disease (ILD) because of heterogeneity in disease-specific and patient-specific variables. Our objective was to determine whether mortality is accurately predicted in patients with chronic ILD using the GAP model, a clinical prediction model based on sex, age, and lung physiology, that was previously validated in patients with idiopathic pulmonary fibrosis.
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              • Article: not found

              Connective tissue disease-associated interstitial lung disease: a call for clarification.

              This commentary highlights the present dilemmas surrounding the classification of a patient with interstitial pneumonia who has clinical features suggesting an associated connective tissue disease but the features fall short of a clear diagnosis of connective tissue disease-associated interstitial lung disease under the current rheumatologic classification systems. This commentary illustrates what we perceive to be the limitations in the present approach to the classification of this group of patients and discusses problems with redefining the diagnosis of undifferentiated connective tissue disease to encompass patients with interstitial pneumonia. Finally, we advocate not only for a multidisciplinary approach to evaluation, but also disease classification and offer a proposal to define them as a distinct phenotype--lung-dominant CTD--for which prognostic, therapeutic, and pathobiologic implications can be tested in future, hopefully multiinstitutional, studies.
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                Author and article information

                Journal
                Ther Clin Risk Manag
                Ther Clin Risk Manag
                Therapeutics and Clinical Risk Management
                Therapeutics and Clinical Risk Management
                Dove Medical Press
                1176-6336
                1178-203X
                2018
                01 November 2018
                : 14
                : 2171-2181
                Affiliations
                [1 ]Division of Rheumatology, Department of Internal Medicine, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705, USA, ssmccoy@ 123456medicine.wisc.edu
                [2 ]Division of Pulmonary and Critical Care, Department of Internal Medicine, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705, USA
                [3 ]Department of Radiology, University of Wisconsin, Madison, WI 53792-3252, USA
                [4 ]Department of Biostatistics, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
                [5 ]Department of Pathology, University of Wisconsin, Madison, WI 53792-3252, USA
                [6 ]Department of Pulmonology, SSM Health Dean Medical Group, Madison, WI 53715, USA
                Author notes
                Correspondence: Sara S McCoy, Division of Rheumatology, Department of Internal Medicine, School of Medicine and Public Health, University of Wisconsin, 1685 Highland Avenue, Madison, WI 53705-2281, USA, Email ssmccoy@ 123456medicine.wisc.edu
                Article
                tcrm-14-2171
                10.2147/TCRM.S173154
                6219314
                © 2018 McCoy et al. This work is published and licensed by Dove Medical Press Limited

                The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License ( http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

                Categories
                Original Research

                Medicine

                interstitial lung disease, autoimmune disease, connective tissue disease, mycophenolate

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