{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T23:21:56Z","timestamp":1790810516018,"version":"4.1.0"},"reference-count":22,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2021,5,20]],"date-time":"2021-05-20T00:00:00Z","timestamp":1621468800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Polish Ministry of Science and Higher Education","award":["BST-162"],"award-info":[{"award-number":["BST-162"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Human epididymis protein 4 (HE4) is an ovarian cancer marker. Various cut-off values of the marker in blood are recommended, depending on the method used for its determination. An alternative biosensor for HE4 determination in blood plasma has been developed. It consists of rabbit polyclonal antibody against HE4, covalently attached to a gold chip via cysteamine linker. The biosensor is used with the non-fluidic array SPRi technique. The linear range of the analytical signal response was found to be 2\u2013120 pM, and the biosensor can be used for the determination of the HE4 marker in the plasma of both healthy subjects and ovarian cancer patients after suitable dilution with a PBS buffer. Precision (6\u201310%) and recovery (101.8\u2013103.5%) were found to be acceptable, and the LOD was equal to 2 pM. The biosensor was validated by the parallel determination of a series of plasma samples from ovarian cancer patients using the Elecsys HE4 test and the developed biosensor, with a good agreement of the results (a Pearson coefficient of 0.989). An example of the diagnostic application of the developed biosensor is given\u2014the influence of ovarian tumor resection on the level of HE4 in blood serum.<\/jats:p>","DOI":"10.3390\/s21103567","type":"journal-article","created":{"date-parts":[[2021,5,20]],"date-time":"2021-05-20T11:45:57Z","timestamp":1621511157000},"page":"3567","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["An SPRi Biosensor for Determination of the Ovarian Cancer Marker HE4 in Human Plasma"],"prefix":"10.3390","volume":"21","author":[{"given":"Beata","family":"Szymanska","sequence":"first","affiliation":[{"name":"Bioanalysis Laboratory, Faculty of Chemistry, University of Bialystok, Ciolkowskiego 1K, 15-245 Bialystok, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1968-1072","authenticated-orcid":false,"given":"Zenon","family":"Lukaszewski","sequence":"additional","affiliation":[{"name":"Faculty of Chemical Technology, Poznan University of Technology, pl. Sklodowskiej-Curie 5, 60-965 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1941-015X","authenticated-orcid":false,"given":"Beata","family":"Zelazowska-Rutkowska","sequence":"additional","affiliation":[{"name":"Department of Pediatric Laboratory Diagnostics, Medical University of Bialystok, Waszyngtona 17, 15-274 Bialystok, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kinga","family":"Hermanowicz-Szamatowicz","sequence":"additional","affiliation":[{"name":"Comprehensive Cancer Center, Department of Clinical Oncology, Ogrodowa 12, 15-027 Bialystok, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ewa","family":"Gorodkiewicz","sequence":"additional","affiliation":[{"name":"Bioanalysis Laboratory, Faculty of Chemistry, University of Bialystok, Ciolkowskiego 1K, 15-245 Bialystok, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,5,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1016\/j.cca.2015.03.047","article-title":"HE4 in the differential diagnosis of ovarian masses","volume":"446","author":"Granato","year":"2015","journal-title":"Clin. 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