Abstract
The incidence of idiopathic pulmonary fibrosis is increasing year by year in the world, which has a greater impact on the quality of life of patients. In the past, symptomatic treatment was used in clinical practice, but the overall effect is still not good. Multiple clinical studies have demonstrated the efficacy of pirfenidone in the treatment of idiopathic pulmonary fibrosis; however, adverse reactions have been reported. We, therefore, systematically evaluated the effectiveness and safety of pirfenidone in patients with idiopathic pulmonary fibrosis. Relevant studies were retrieved from the Embase, PubMed, Web of Science, Cochrane Library, China National Knowledge Infrastructure (CNKI), Chinese Biomedical Literature (CBM), Wanfang and Weipu databases between January 1999 and May 2020, including the keywords "pirfenidone" and "idiopathic pulmonary fibrosis", were included in our systematic review. Review Manager 5.4 software was used for data synthesis, and analyses of publication bias and sensitivity. Our systematic review included 13 studies involving a total of 13247 patients with idiopathic pulmonary fibrosis. Pirfenidone was associated with reduced declines in vital capacity (VC) and forced vital capacity (FVC) from baseline in patients with hermansky-pudlak syndrome (HPS)-related pulmonary fibrosis and to moderate idiopathic pulmonary fibrosis (IPF). Pirfenidone treatment was associated with lower reductions in FVC, lower reductions in 6-minute walking test distance, lower decreases in minimum oxygen saturation during the 6-minute walking test, lower all-cause death, lower relative risk of IPF-related death and increased progression-free survival compared to placebo. Progression-free survival was significantly longer in the pirfenidone group. The incidence of gastrointestinal, skin, nervous system, and liver function-related adverse events was significantly higher in the pirfenidone group compared to the control group. Pirfenidone has efficacy in delaying the progression of idiopathic pulmonary fibrosis. Pirfenidone is well-tolerated by the majority of patients; however, mild adverse reactions related to the gastrointestinal tract, skin, nervous system, and liver function are common. Overall, Pirfenidone may be an effective and well-tolerated treatment option for idiopathic pulmonary fibrosis.
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