{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T02:25:40Z","timestamp":1760235940479,"version":"build-2065373602"},"reference-count":78,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2021,10,15]],"date-time":"2021-10-15T00:00:00Z","timestamp":1634256000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JPM"],"abstract":"<jats:p>Cutaneous squamous cell carcinoma (cSCC), a malignant proliferation of the cutaneous epithelium, is the second most common skin cancer after basal cell carcinoma (BCC). Unlike BCC, cSCC exhibits a greater aggressiveness and the ability to metastasize to any organ in the body. Chronic inflammation and immunosuppression are important processes linked to the development of cSCC. The tumor can occur de novo or from the histological transformation of preexisting actinic keratoses (AK). Malignant cells exhibit a higher amount of sialic acid in their membranes than normal cells, and changes in the amount, type, or linkage of sialic acid in malignant cell glycoconjugates are related to tumor progression and metastasis. The aim of our study was to investigate the sialyation in patients with cSCC and patients with AK. We have determined the serum levels of total sialic acid (TSA), lipid-bound sialic acid (LSA), beta-galactoside 2,6-sialyltransferase I (ST6GalI), and neuraminidase 3 (NEU3) in 40 patients with cSCC, 28 patients with AK, and 40 healthy subjects. Data analysis indicated a significant increase in serum levels of TSA (p &lt; 0.001), LSA (p &lt; 0.001), ST6GalI (p &lt; 0.001), and NEU3 (p &lt; 0.001) in the cSCC group compared to the control group, whereas in patients with AK only the serum level of TSA was significantly higher compared to the control group (p &lt; 0.001). When the cSCC and AK groups were compared, significant differences between the serum levels of TSA (p &lt; 0.001), LSA (p &lt; 0.001), ST6GalI (p &lt; 0.001) and NEU3 (p &lt; 0.001) were found. The rate of synthesis of sialoglycoconjugates and their rate of enzymatic degradation, expressed by the ST6GalI\/NEU3 ratio, is 1.64 times lower in the cSCC group compared to the control group (p &lt; 0.01) and 1.53 times lower compared to the AK group (p &lt; 0.01). The tumor diameter, depth of invasion, and Ki67 were associated with higher levels of TSA and LSA. These results indicate an aberrant sialylation in cSCC that correlates with tumor aggressiveness.<\/jats:p>","DOI":"10.3390\/jpm11101027","type":"journal-article","created":{"date-parts":[[2021,10,15]],"date-time":"2021-10-15T13:35:47Z","timestamp":1634304947000},"page":"1027","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Serum Sialylation Changes in Actinic Keratosis and Cutaneous Squamous Cell Carcinoma Patients"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4983-7648","authenticated-orcid":false,"given":"Mircea","family":"Tampa","sequence":"first","affiliation":[{"name":"Department of Dermatology, \u2018Carol Davila\u2019 University of Medicine and Pharmacy, 020021 Bucharest, Romania"},{"name":"Department of Dermatology, \u2018Victor Babes\u2019 Clinical Hospital for Infectious Diseases, 030303 Bucharest, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ilinca","family":"Nicolae","sequence":"additional","affiliation":[{"name":"Department of Dermatology, \u2018Victor Babes\u2019 Clinical Hospital for Infectious Diseases, 030303 Bucharest, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cristina Iulia","family":"Mitran","sequence":"additional","affiliation":[{"name":"Department of Microbiology, \u2018Carol Davila\u2019 University of Medicine and Pharmacy, 020021 Bucharest, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Madalina Irina","family":"Mitran","sequence":"additional","affiliation":[{"name":"Department of Microbiology, \u2018Carol Davila\u2019 University of Medicine and Pharmacy, 020021 Bucharest, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cosmin","family":"Ene","sequence":"additional","affiliation":[{"name":"Departments of Urology, \u2018Carol Davila\u2019 University of Medicine and Pharmacy, 020021 Bucharest, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Clara","family":"Matei","sequence":"additional","affiliation":[{"name":"Department of Dermatology, \u2018Carol Davila\u2019 University of Medicine and Pharmacy, 020021 Bucharest, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Simona Roxana","family":"Georgescu","sequence":"additional","affiliation":[{"name":"Department of Dermatology, \u2018Carol Davila\u2019 University of Medicine and Pharmacy, 020021 Bucharest, Romania"},{"name":"Department of Dermatology, \u2018Victor Babes\u2019 Clinical Hospital for Infectious Diseases, 030303 Bucharest, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Corina Daniela","family":"Ene","sequence":"additional","affiliation":[{"name":"Department of Nephrology, \u2018Carol Davila\u2019 Nephrology Hospital, 010731 Bucharest, Romania"},{"name":"Departments of Nephrology, \u2018Carol Davila\u2019 University of Medicine and Pharmacy, 020021 Bucharest, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,10,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"603","DOI":"10.1007\/s12325-019-01130-1","article-title":"Recognising Skin Cancer in Primary Care","volume":"37","author":"Jones","year":"2020","journal-title":"Adv. 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