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Sarcoidosis is a highly variable, systemic granulomatous disease of hitherto unknown aetiology. The GenPhenReSa (Genotype-Phenotype Relationship in Sarcoidosis) project represents a European multicentre study to investigate the influence of genotype on disease phenotypes in sarcoidosis.The baseline phenotype module of GenPhenReSa comprised 2163 Caucasian patients with sarcoidosis who were phenotyped at 31 study centres according to a standardised protocol.From this module, we found that patients with acute onset were mainly female, young and of Scadding type I or II. Female patients showed a significantly higher frequency of eye and skin involvement, and complained more of fatigue. Based on multidimensional correspondence analysis and subsequent cluster analysis, patients could be clearly stratified into five distinct, yet undescribed, subgroups according to predominant organ involvement: 1) abdominal organ involvement, 2) ocular-cardiac-cutaneous-central nervous system disease involvement, 3) musculoskeletal-cutaneous involvement, 4) pulmonary and intrathoracic lymph node involvement, and 5) extrapulmonary involvement.These five new clinical phenotypes will be useful to recruit homogenous cohorts in future biomedical studies., Competing Interests: Conflict of interest: Disclosures can be found alongside this article at erj.ersjournals.com, (Copyright ©ERS 2018.)

The approach to treating a rare disease is different to that taken for more common diseases. Small patient cohorts alter clinical trial design and limit enrollment, and the picture for rare lung diseases is further complicated by the fact that most are composed of a variety of clinical phenotypes. Since the outcome measures of lung impairment have considerable test-to-test variability, potential new therapies face a substantial challenge. In this paper we will review the current sources of clinical data for rare lung diseases and the regulatory challenges encountered by their treatment, with particular reference to alpha(1)-antitrypsin deficiency, lymphangioleiomyomatosis, cystic fibrosis, and pulmonary alveolar proteinosis. Strategies will also be identified for the better utilization of available data from patients with rare lung diseases, recognizing that the development cost of new therapies and the number of patients who will ultimately use them may not be aligned. Also important is improved communication between patients and their organizations, basic researchers, clinicians and their registries, drug developers, regulators such as the European Medicines Agency, and national health services. At present, licensing and reimbursement requirements are not aligned, either nationally or internationally, and variations also exist in drug availability between countries because of different national licensing and reimbursement rules. The changes needed to optimize European rare lung disease therapies include a commitment to develop empowered patient communities as advocates for therapy, the development of novel trial designs with new endpoints, and for regulatory bodies to be willing to accept nontraditional models of efficacy for orphan drugs., (Copyright © 2012 Elsevier Ltd. All rights reserved.)

The protein and molecular characteristics of variants of the alpha1-antitrypsin (AAT) gene are described, and available data on the genetic epidemiology of AAT deficiency are presented.