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Breath Res."],"published-print":{"date-parts":[[2026,12,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Cystic fibrosis (CF) is a genetic disorder characterized by chronic airway infection and progressive lung damage. Early identification of biomarkers associated with respiratory pathogens and inflammatory processes is crucial for improving disease monitoring and guiding therapy. Analysis of volatile organic compounds (VOCs) in exhaled breath has emerged as a promising non-invasive approach for biomarker discovery. This systematic review aimed to identify and summarize VOCs detected in the exhaled breath of patients with CF that may serve as potential clinical biomarkers. A systematic literature search was conducted in accordance with preferred reporting items for systematic reviews and meta-analyses guidelines across MEDLINE, Web of Science, SCOPUS, and Google Scholar, covering publications from 2000 to 2026. Studies comparing VOC profiles in patients with CF and control groups were included. The risk of bias in the included studies was assessed using the Newcastle\u2013Ottawa Scale. Out of 431 identified records, 27 studies met the inclusion criteria and were included in the qualitative synthesis. These studies employed a variety of analytical platforms, including gas chromatography\u2013mass spectrometry (MS), selected-ion flow-tube MS and proton transfer reaction MS. Across all studies, a total of 121 VOCs were reported in association with CF. Several compounds, including hydrogen cyanide, 2-aminoacetophenone, pentane, and dimethyl sulfide, were repeatedly identified and may represent potential biomarkers related to bacterial colonization, oxidative stress, and inflammatory processes. However, substantial heterogeneity was observed among studies with respect to study design, patient populations, breath sampling protocols, and analytical methodologies. Breath analysis based on VOCs represents a promising non-invasive approach for identifying biomarkers of CF and associated respiratory infections. Nevertheless, future progress in breathomics will primarily depend on improving methodological rigor rather than limiting the diversity of analytical platforms. Standardized breath sampling protocols, rigorous preprocessing workflows for MS data, sufficiently powered multicenter studies, and external validation in independent patient cohorts are essential prerequisites for the clinical implementation of breath-based biomarkers.<\/jats:p>","DOI":"10.1088\/1752-7163\/ae9be1","type":"journal-article","created":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T22:50:39Z","timestamp":1787179839000},"page":"044001","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Exhaled breath volatile organic compounds in cystic fibrosis: a systematic review"],"prefix":"10.1088","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0250-9949","authenticated-orcid":true,"given":"Malika","family":"Mustafina","sequence":"first","affiliation":[{"name":"Functional and Ultrasound Diagnostics, I.M. Sechenov First Moscow State Medical University (Sechenov University)"},{"name":"National Medical Research Center for Pulmonology under Federal Medical and Biological Agency of Russian Federation"},{"name":"Research Institute for Systemic Analysis of the Russian Academy of Sciences"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"}]},{"given":"Stanislav","family":"Krasovskiy","sequence":"additional","affiliation":[{"name":"National Medical Research Center for Pulmonology under Federal Medical and Biological Agency of Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2001-5504","authenticated-orcid":true,"given":"Alexander","family":"Chernyak","sequence":"additional","affiliation":[{"name":"National Medical Research Center for Pulmonology under Federal Medical and Biological Agency of Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"}]},{"given":"Artemiy","family":"Silantyev","sequence":"additional","affiliation":[{"name":"I.M. Sechenov First Moscow State Medical University (Sechenov University)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergey","family":"Avdeev","sequence":"additional","affiliation":[{"name":"I. M. Sechenov First Moscow State Medical University (Sechenov University)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6452-1222","authenticated-orcid":true,"given":"Abram","family":"Syrkin","sequence":"additional","affiliation":[{"name":"Functional and Ultrasound Diagnostics, I.M. Sechenov First Moscow State Medical University (Sechenov University)"},{"name":"Research Institute for Systemic Analysis of the Russian Academy of Sciences"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philipp","family":"Kopylov","sequence":"additional","affiliation":[{"name":"Functional and Ultrasound Diagnostics, I.M. 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