{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T06:36:04Z","timestamp":1788935764376,"version":"build-2803163510"},"reference-count":39,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2026,1,23]],"date-time":"2026-01-23T00:00:00Z","timestamp":1769126400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003336","name":"National Science Fund of Bulgaria","doi-asserted-by":"crossref","award":["KP-06-COST\/30\/2024"],"award-info":[{"award-number":["KP-06-COST\/30\/2024"]}],"id":[{"id":"10.13039\/501100003336","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Oral squamous cell carcinoma (OSCC) remains a major therapeutic challenge due to aggressive progression, high recurrence, and limited selectivity of current treatments. In this study, a series of seven 4-amino-2-substituted tetrahydrobenzothieno[2,3-d]pyrimidines were evaluated for their cytotoxic, antiproliferative, and mechanistic effects against oral cancer cell lines with different metastatic potential (HSC-3 and SCC-9), alongside non-tumorigenic keratinocytes (HaCaTs). Several compounds demonstrated selective anticancer activity, with Compounds 5 and 6 showing the most favorable balance between potency and selectivity. Antiproliferative assays revealed effective inhibition of cancer cell growth, while clonogenic assays confirmed a pronounced reduction in long-term survival, particularly in highly metastatic HSC-3 cells. Mechanistic studies indicated that the anticancer effects are associated with S-phase cell cycle arrest, apoptosis induction, and profound disruption of the actin cytoskeleton. In silico ADME and drug-likeness analyses supported the lead-like properties of the most active derivatives. Overall, these findings identify thienopyrimidine derivatives as promising scaffolds for the development of targeted therapies against OSCC and warrant further optimization and in vivo evaluation.<\/jats:p>","DOI":"10.3390\/molecules31030397","type":"journal-article","created":{"date-parts":[[2026,1,23]],"date-time":"2026-01-23T17:52:38Z","timestamp":1769190758000},"page":"397","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Anticancer Potential of Thieno[2,3-d]pyrimidine Derivatives in Oral Carcinoma Models"],"prefix":"10.3390","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2480-5116","authenticated-orcid":false,"given":"Ivan","family":"Iliev","sequence":"first","affiliation":[{"name":"Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 25, 1113 Sofia, Bulgaria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aleksandrina","family":"Nesheva","sequence":"additional","affiliation":[{"name":"Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. 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Bonchev Str., Bl. 9, 1113 Sofia, Bulgaria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8097-3608","authenticated-orcid":false,"given":"Aneliya","family":"Kostadinova","sequence":"additional","affiliation":[{"name":"Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2373-7713","authenticated-orcid":false,"given":"Severina","family":"Semkova","sequence":"additional","affiliation":[{"name":"Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Albena","family":"Momchilova","sequence":"additional","affiliation":[{"name":"Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. 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Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,1,23]]},"reference":[{"key":"ref_1","unstructured":"World Cancer Research Fund (2025, March 07). Mouth and Oral Cancer Statistics. Available online: https:\/\/www.wcrf.org\/preventing-cancer\/cancer-statistics\/mouth-and-oral-cancer-statistics."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1002\/ijc.23033","article-title":"Tobacco smoking and cancer: A meta-analysis","volume":"122","author":"Gandini","year":"2008","journal-title":"Int. J. Cancer"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"431","DOI":"10.1097\/CEJ.0b013e32833d936d","article-title":"Alcohol consumption and cancers of the oral cavity and pharynx from 1988 to 2009: An update","volume":"19","author":"Goldstein","year":"2010","journal-title":"Eur. J. 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