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The main objective of this study was to explore the diagnostic potential of OS markers in patients with CRC, which may translate into an early diagnosis of the disease. To do this, we compared results with those in a group of healthy controls and assessed whether there were significant differences. In addition, we explored possible correlations with the presence of tumors and tumor stage, with anemia and with inflammatory markers used in clinical practice. The study included 80 patients with CRC and 60 healthy controls. The following OS markers were analyzed: catalase (CAT), reduced glutathione (GSH) and oxidized glutathione (GSSG) in serum; and 8-oxo-7,8-dihydro-2\u2032-deoxyguanosine (8-oxodG) and F2-isoprotanes in urine (F2-IsoPs). Tumor markers (CEA and CA 19.9), anemia markers (hemoglobin, hematocrit and medium corpuscular volume) and inflammatory markers (leukocytes, neutrophils, N\/L index, platelets, fibrinogen, C-reactive protein, CRP and IL-6) were also determined. Comparison of means between patients and controls revealed highly significant differences for all OS markers, with an increase in the prooxidant markers GSSG, GSSG\/GSH ratio, 8-oxodG and F2-IsoPs, and a decrease in the antioxidant markers CAT and GSH. Tumor and inflammatory markers (except CRP) correlated positively with GSSG, GSSG\/GSH ratio, 8-oxodG and F2-IsoPs, and negatively with CAT and GSH. In view of the results obtained, OS markers may constitute a useful tool for the early diagnosis of CRC patients.<\/jats:p>","DOI":"10.3390\/ijms231911664","type":"journal-article","created":{"date-parts":[[2022,10,8]],"date-time":"2022-10-08T22:19:27Z","timestamp":1665267567000},"page":"11664","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":50,"title":["Oxidative Stress and DNA Damage Markers in Colorectal Cancer"],"prefix":"10.3390","volume":"23","author":[{"given":"Delia","family":"Acevedo-Le\u00f3n","sequence":"first","affiliation":[{"name":"Servicio de An\u00e1lisis Cl\u00ednicos, Hospital Universitario Dr. Peset-FISABIO, 46017 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lidia","family":"Monz\u00f3-Beltr\u00e1n","sequence":"additional","affiliation":[{"name":"Departamento de Bioqu\u00edmica y Biolog\u00eda Molecular, Facultad de Medicina y Odontotolog\u00eda-INCLIVA, Universidad de Valencia, 46010 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"P\u00e9rez-S\u00e1nchez","sequence":"additional","affiliation":[{"name":"Servicio de An\u00e1lisis Cl\u00ednicos, Hospital Universitario Dr. Peset-FISABIO, 46017 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eva","family":"Naranjo-Morillo","sequence":"additional","affiliation":[{"name":"Servicio de An\u00e1lisis Cl\u00ednicos, Hospital Universitario Dr. Peset-FISABIO, 46017 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Segundo \u00c1ngel","family":"G\u00f3mez-Abril","sequence":"additional","affiliation":[{"name":"Servicio de Cirug\u00eda General y Aparato Digestivo, Hospital Universitario Dr. Peset-FISABIO, 46017 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nuria","family":"Esta\u00f1-Capell","sequence":"additional","affiliation":[{"name":"Servicio de An\u00e1lisis Cl\u00ednicos, Hospital Universitario Dr. Peset-FISABIO, 46017 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8077-7642","authenticated-orcid":false,"given":"Celia","family":"Ba\u00f1uls","sequence":"additional","affiliation":[{"name":"Servicio de Endocrinolog\u00eda y Nutrici\u00f3n, Hospital Universitario Dr. Peset-FISABIO, 46017 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8164-4048","authenticated-orcid":false,"given":"Guillermo","family":"S\u00e1ez","sequence":"additional","affiliation":[{"name":"Servicio de An\u00e1lisis Cl\u00ednicos, Hospital Universitario Dr. Peset-FISABIO, 46017 Valencia, Spain"},{"name":"Departamento de Bioqu\u00edmica y Biolog\u00eda Molecular, Facultad de Medicina y Odontotolog\u00eda-INCLIVA, Universidad de Valencia, 46010 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,1]]},"reference":[{"key":"ref_1","unstructured":"(2022, September 13). 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