European respiratory review : an official journal of the European Respiratory Society
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The magnitude of treatment effect can be assessed by a number of methods. One method of collectively analysing data is that used by the Cochrane Collaboration. Their systematic reviews identify, analyse and present research-based evidence in an accessible format. ⋯ Two Japanese trials of treatment with pirfenidone were combined, and a positive effect of pirfenidone on pulmonary function decline was observed. Meta-analysis of three phase III studies suggested that pirfenidone significantly increased progression-free survival by 30%. The findings of this systematic review, although not presenting new original data, together with an acceptable safety profile, suggest that pirfenidone may have a role in IPF treatment.
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Idiopathic pulmonary fibrosis (IPF) is a life-threatening condition, with a median survival of <3 yrs. The pathophysiology is not fully understood, but chronic injury of alveolar epithelial type II cells (AECII) is considered key. In IPF, disturbed folding and processing of surfactant proteins and impaired DNA repair may represent underlying reasons for maladaptive endoplasmic reticulum stress responses, increased reactive oxygen species production and/or DNA damage. ⋯ Fibroblast proliferation, transdifferentiation and matrix deposition may be mediated through various mechanisms including epithelial-mesenchymal transition, fibrocyte invasion or expansion of a local fibroblast population. Treatment modalities aiming to attenuate epithelial injury are currently in early pre-clinical development and may reach the clinical arena in only a few years. Meanwhile, novel drugs acting on highly activated fibroblasts such as pirfenidone, an anti-fibrotic drug authorised for IPF in the European Union, or BIBF 1120, a novel triple-kinase inhibitor (blocking vascular endothelial growth factor, platelet-derived growth factor and fibroblast growth factor) currently under clinical investigation, seem to attenuate the progression of IPF.
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A diagnosis of idiopathic pulmonary fibrosis (IPF) has serious implications for the affected individuals, who have a 50% likelihood of dying within 2-3 yrs, an outcome which is worse than many cancers. A swift and accurate diagnosis is imperative, especially as commencing treatment at a relatively early disease stage may have the greatest impact on reducing disease progression. The 2011, IPF guidelines provide updated and simplified IPF diagnostic criteria that may facilitate making a more confident diagnosis. ⋯ When HRCT honeycombing is absent, even in the presence of all other features including traction bronchiectasis, the guidelines provide no designation for this constellation of features that many clinicians and radiologists would regard as consistent with UIP. The diagnostic algorithm suggested by the 2011 guidelines emphasises the importance of multidisciplinary discussion between clinicians, radiologists and pathologists to improve diagnostic confidence. The course of disease in IPF is unpredictable, but the importance of an early diagnosis is clear, as individuals with less severe lung function abnormalities have a better prognosis.
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Review
Changing the idiopathic pulmonary fibrosis treatment approach and improving patient outcomes.
Idiopathic pulmonary fibrosis (IPF) is a progressively fibrotic disease, with no effective treatment and a median survival time of 2-5 yrs. The search for effective treatment has involved numerous clinical trials of investigational agents without significant success until 2011, when European approval was given for the first treatment for IPF, pirfenidone. Four key clinical trials supported the efficacy and tolerability of pirfenidone. ⋯ Evidence of beneficial effects of pirfenidone treatment was also observed with regard to several secondary end-points, including progression-free survival time, categorical FVC change, and mean change from baseline to week 72 in 6MWT distance. Pirfenidone was generally well tolerated, with the most common side-effects being gastrointestinal discomfort and photosensitivity. The pooled study results, coupled with recent data regarding the prognostic significance of changes in FVC and 6MWT, provide further evidence of a clinically meaningful treatment benefit with pirfenidone in patients with IPF.