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It is hypothesised that plasma levels of OPN may correlate with the presence of coronary artery disease, \u201cCAD\u201d. This offers potential as a point-of-care testing biomarker for early diagnosis, disease monitoring, and prognosis. This review evaluates the current literature on the association between plasma OPN levels and coronary artery disease and what is currently known to support its potential as a biomarker for future practice. Electronic searches of MEDLINE and EMBASE databases were undertaken from inception until July 2024. Thirty-three studies met the inclusion criteria. All studies were observational, with gross heterogeneity in methods used to analyse the association of plasma OPN with clinical characteristics. They included case series, case\u2013control, cross-sectional, and cohort study designs. OPN has been linked to higher cardiovascular risk and unfavourable cardiovascular outcomes. However, the evidence regarding the direct assessment of CAD severity using tools like the SYNTAX or TIMI scores, which focus on anatomical complexity and risk factors, is less definitive. This suggests that OPN may be a more precise reflection of the inflammatory processes and atherosclerotic activity contributing to unfavourable outcomes rather than a direct indicator of the anatomical severity of CAD itself. Consequently, OPN is increasingly perceived as a marker of a poor prognosis rather than a tool for assessing the severity of coronary artery lesions.<\/jats:p>","DOI":"10.3390\/cells14020106","type":"journal-article","created":{"date-parts":[[2025,1,13]],"date-time":"2025-01-13T09:49:17Z","timestamp":1736761757000},"page":"106","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Osteopontin as a Biomarker for Coronary Artery Disease"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2209-0559","authenticated-orcid":false,"given":"Georgia R.","family":"Layton","sequence":"first","affiliation":[{"name":"Department of Cardiovascular Sciences, University of Leicester, Leicester LE1 7RH, UK"},{"name":"Department of Cardiac Surgery, University Hospitals of Leicester NHS Trust, Leicester LE1 5WW, UK"},{"name":"Leicester British Heart Foundation Centre of Research Excellence, Glenfield Hospital, Groby Road, Leicester LE3 9QP, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4374-7476","authenticated-orcid":false,"given":"Ibrahim","family":"Antoun","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Sciences, University of Leicester, Leicester LE1 7RH, UK"},{"name":"Department of Cardiology, University Hospitals of Leicester NHS Trust, Leicester LE3 9QP, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alice","family":"Copperwheat","sequence":"additional","affiliation":[{"name":"Department of Cardiac Surgery, University Hospitals of Leicester NHS Trust, Leicester LE1 5WW, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-3679-143X","authenticated-orcid":false,"given":"Zaidhan Latif","family":"Khan","sequence":"additional","affiliation":[{"name":"University of Lancaster, Bailrigg, Lancaster LA1 4YW, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sanjay S.","family":"Bhandari","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Sciences, University of Leicester, Leicester LE1 7RH, UK"},{"name":"Department of Cardiology, University Hospitals of Leicester NHS Trust, Leicester LE3 9QP, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5162-3644","authenticated-orcid":false,"given":"Riyaz","family":"Somani","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Sciences, University of Leicester, Leicester LE1 7RH, UK"},{"name":"Department of Cardiology, University Hospitals of Leicester NHS Trust, Leicester LE3 9QP, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5965-0671","authenticated-orcid":false,"given":"Andr\u00e9","family":"Ng","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Sciences, University of Leicester, Leicester LE1 7RH, UK"},{"name":"Leicester British Heart Foundation Centre of Research Excellence, Glenfield Hospital, Groby Road, Leicester LE3 9QP, UK"},{"name":"Department of Cardiology, University Hospitals of Leicester NHS Trust, Leicester LE3 9QP, UK"},{"name":"National Institute of Health Research, Leicester LE5 4PW, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mustafa","family":"Zakkar","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular Sciences, University of Leicester, Leicester LE1 7RH, UK"},{"name":"Department of Cardiac Surgery, University Hospitals of Leicester NHS Trust, Leicester LE1 5WW, UK"},{"name":"Leicester British Heart Foundation Centre of Research Excellence, Glenfield Hospital, Groby Road, Leicester LE3 9QP, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,1,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"7675437","DOI":"10.1155\/2016\/7675437","article-title":"Osteopontin Bridging Innate and Adaptive Immunity in Autoimmune Diseases","volume":"2016","author":"Clemente","year":"2016","journal-title":"J. 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