{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,6,19]],"date-time":"2025-06-19T04:41:09Z","timestamp":1750308069141,"version":"3.41.0"},"reference-count":30,"publisher":"Media Sphere Publishing House","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Rus. J. Arch. Pathol."],"published-print":{"date-parts":[[2025,6,18]]},"abstract":"<jats:p>Objective. To evaluate the MMR system proteins and the MSI status of regenerative (indefinite for dysplasia) and pronounced (epithelial dysplasia) gastric mucosa precancerous lesions in the comparison with cancer to determine their possible potential as a diagnostic markers of gastric mucosa dysplasia. Material and methods. The study included 2 groups of gastric mucosa specimens: (1) 150 biopsy gastric mucosa specimens: 43 with low-grade dysplasia, 32 with high-grade dysplasia, 75 \u2014 indefinite for dysplasia; (2) 155 cancer tissue specimens from resected stomachs. Gastric mucosa specimens were examined histologically, immunohistochemically using mouse monoclonal antibodies to the MMR system proteins: MLH-1, MSH2, MSH6, PMS2 (Diagnostic BioSystems, USA). MSI was studied with multiplex PCR evaluation of DNA microsatellites (NR-21, NR-24, NR-27, BAT-25, BAT-26) from paraffin sections, their analysis with capillary electrophoresis. The obtained data were processed with the Statistica 10.0 (StatSoft, USA), presented using descriptive, analytical statistics. Results. MSI was detected by immunohistochemistry in 8% (n=6) of the studied cases of low\/high grade dysplasia, which does not have statistically significant differences from the distribution of MSI in the gastric cancer group (12% of microsatellite-unstable cases (n=18)) (p=0.49). MSI was not detected in any indefinite for dysplasia case. Conclusion. Detection of microsatellite instability in gastric mucosa dysplasia indicates the likelihood of its occurrence at the early stages of the carcinogenesis cascade and makes it possible to use it to assess the risk of gastric cancer associated with microsatellite instability. The absence of instability in cases indefinite for dysplasia determines the possibility of its use for differential diagnosis of truly neoplastic and regenerative\/reactive changes in the gastric mucosa.<\/jats:p>","DOI":"10.17116\/patol2025870315","type":"journal-article","created":{"date-parts":[[2025,6,18]],"date-time":"2025-06-18T15:44:03Z","timestamp":1750261443000},"page":"5","source":"Crossref","is-referenced-by-count":0,"title":["Microsatellite instability as a possible diagnostic marker of the gastric mucosa dysplasia"],"prefix":"10.17116","volume":"87","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8607-7831","authenticated-orcid":false,"given":"A.V.","family":"Kononov","sequence":"first","affiliation":[{"name":"Omsk State Medical University","place":["Omsk, Russia"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1834-3629","authenticated-orcid":false,"given":"V.A.","family":"Rubtsov","sequence":"additional","affiliation":[{"name":"Omsk State Medical University","place":["Omsk, Russia"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8006-3260","authenticated-orcid":false,"given":"M.N.","family":"Parygina","sequence":"additional","affiliation":[{"name":"Omsk State Medical University","place":["Omsk, Russia"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-9957-5889","authenticated-orcid":false,"given":"E.V.","family":"Demidova","sequence":"additional","affiliation":[{"name":"\u00abVector-Best\u00bb","place":["Koltsovo, Russia"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7200-7082","authenticated-orcid":false,"given":"S.I.","family":"Mozgovoi","sequence":"additional","affiliation":[{"name":"Omsk State Medical University","place":["Omsk, Russia"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9857-1674","authenticated-orcid":false,"given":"E.G.","family":"Pomorgailo","sequence":"additional","affiliation":[{"name":"Omsk State Medical University","place":["Omsk, Russia"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0949-8709","authenticated-orcid":false,"given":"A.G.","family":"Shimanskaya","sequence":"additional","affiliation":[{"name":"Omsk State Medical University","place":["Omsk, Russia"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5356-9669","authenticated-orcid":false,"given":"M.V.","family":"Markelova","sequence":"additional","affiliation":[{"name":"Omsk State Medical University","place":["Omsk, Russia"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"6743","reference":[{"key":"key-10.17116\/patol2025870315-1","doi-asserted-by":"publisher","DOI":"10.3322\/caac.21834"},{"key":"key-10.17116\/patol2025870315-2","unstructured":"Kaprin AD, Starinskii VV, Shakhzadova AO, Lisichnikova IV, eds. 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