{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T01:45:45Z","timestamp":1793151945681,"version":"4.5.0"},"reference-count":39,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2023,6,13]],"date-time":"2023-06-13T00:00:00Z","timestamp":1686614400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Canadian Dermatology Foundation (CDF)","award":["R124-A7592 Rp12350"],"award-info":[{"award-number":["R124-A7592 Rp12350"]}]},{"name":"Bispebjerg Hospital","award":["R124-A7592 Rp12350"],"award-info":[{"award-number":["R124-A7592 Rp12350"]}]},{"name":"University of Alberta","award":["R124-A7592 Rp12350"],"award-info":[{"award-number":["R124-A7592 Rp12350"]}]},{"name":"University Hospital Foundation","award":["R124-A7592 Rp12350"],"award-info":[{"award-number":["R124-A7592 Rp12350"]}]},{"name":"Danish Cancer Society","award":["R124-A7592 Rp12350"],"award-info":[{"award-number":["R124-A7592 Rp12350"]}]},{"name":"Mitacs","award":["R124-A7592 Rp12350"],"award-info":[{"award-number":["R124-A7592 Rp12350"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cells"],"abstract":"<jats:p>Ultraviolet (UV) radiation is a strong environmental carcinogen responsible for the pathogenesis of most skin cancers, including malignant melanoma (MM) and non-melanoma (keratinocyte) skin cancers. The carcinogenic role of UV was firmly established based on epidemiological evidence and molecular findings of the characteristic mutation signatures which occur during the excision repair of cyclobutane pyrimidine dimers and 6,4-photoproducts. The role of UV in the pathogenesis of mycosis fungoides (MF), the most common type of primary cutaneous T-cell lymphoma, remains controversial. Here, we performed whole-exome sequencing of 61 samples of MF cells microdissected from cutaneous lesions, and compared their mutational signatures to 340 MMs. The vast majority of MM mutations had a typical UV mutational signature (SBS 7, SBS 38, or DSB 1), underscoring the key role of ultraviolet as a mutagen. In contrast, the SBS 7 signature in MF comprised &lt; 5% of all mutations. SBS 7 was higher in the intraepidermal MF cells (when compared to the dermal cells) and in the cells from tumors as compared to that in early-stage plaques. In conclusion, our data do not support the pathogenic role of UV in the pathogenesis of MF and suggest that the UV mutations are the result of the cumulative environmental ultraviolet exposure of cutaneous lesions rather than an early mutagenic event.<\/jats:p>","DOI":"10.3390\/cells12121616","type":"journal-article","created":{"date-parts":[[2023,6,14]],"date-time":"2023-06-14T01:32:15Z","timestamp":1686706335000},"page":"1616","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Is Cutaneous T-Cell Lymphoma Caused by Ultraviolet Radiation? A Comparison of UV Mutational Signatures in Malignant Melanoma and Mycosis Fungoides"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2310-8300","authenticated-orcid":false,"given":"Robert","family":"Gniadecki","sequence":"first","affiliation":[{"name":"Division of Dermatology, University of Alberta, Edmonton, AB T6G 2G3, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sandra","family":"O\u2019Keefe","sequence":"additional","affiliation":[{"name":"Division of Dermatology, University of Alberta, Edmonton, AB T6G 2G3, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dylan","family":"Hennessey","sequence":"additional","affiliation":[{"name":"Division of Dermatology, University of Alberta, Edmonton, AB T6G 2G3, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7370-2378","authenticated-orcid":false,"given":"Aishwarya","family":"Iyer","sequence":"additional","affiliation":[{"name":"Division of Dermatology, University of Alberta, Edmonton, AB T6G 2G3, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,6,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2","DOI":"10.12788\/j.sder.2018.002","article-title":"Mycosis Fungoides-Clinical and Histopathologic Features, Differential Diagnosis, and Treatment","volume":"37","author":"Cerroni","year":"2018","journal-title":"Semin. 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