1. Primary Cutaneous NUT Carcinoma: Clinicopathologic and Genetic Study of 4 Cases.
- Author
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Goto K, Kukita Y, Hishima T, Matsushita S, Tsuyuki T, Makihara K, Koga K, Mukumoto S, and Honma K
- Subjects
- Humans, Female, Aged, Aged, 80 and over, Nuclear Proteins genetics, Neoplasm Proteins genetics, Genetic Predisposition to Disease, Gene Rearrangement, Carcinoma genetics, Carcinoma pathology, Carcinoma mortality, Carcinoma chemistry, Oncogene Proteins, Fusion genetics, Bromodomain Containing Proteins, Cell Cycle Proteins, Skin Neoplasms genetics, Skin Neoplasms pathology, Skin Neoplasms mortality, Biomarkers, Tumor genetics, Biomarkers, Tumor analysis, Transcription Factors genetics
- Abstract
WHO Classification of Skin Tumors, fifth edition (2023) has newly described primary cutaneous NUT carcinoma; however, information on this cancer type remains scarce. Herein, we performed clinicopathologic and genetic analyses of 4 cases. Four elderly women (median age 77 y, range: 68 to 82 y) were included. The median tumor size was 12.5 (10 to 40 mm). Tumors were located on the scalp, temple, thigh, and palm. Two (50%) patients presented with regional lymph node metastases. Neither distant metastasis nor mortality was observed during patient follow-up of 10.5 (3 to 15) months. Sanger, panel DNA and whole-exome RNA sequencing revealed BRD3::NUTM1 (n=2) and BRD4::NUTM1 (n=2) fusions. Histology of BRD3 -rearranged tumors revealed an epidermal connection, relatively small tumor nests, and ductal or intracytoplasmic luminal formation, whereas that of BRD4 -rearranged tumors revealed large solid nests comprising discohesive tumor cells. NUT, cytokeratins, p63, EMA, TRPS1, c-MYB, CD56, and INSM1 were immunoexpressed to varying degrees in all (100%) tumors. Furthermore, diffuse SOX10 expression was common (3/4, 75%). The literature review of five previously described cases revealed women predominance, no recurrence, frequent BRD3::NUTM1 fusions, and histology of ductoglandular structures. Our study findings and literature suggest elderly women predominance, relatively frequent BRD3::NUTM1 fusions, histopathologic ductoglandular differentiation, absence of abrupt keratinisation, and a characteristic immunoprofile in primary cutaneous NUT carcinoma, unlike in that of other organ. No distant metastasis or disease-associated mortality was seen in all cases with limited follow-up., Competing Interests: Conflicts of Interest and Source of Funding: The authors have disclosed that they have no significant relationships with, or financial interest in, any commercial companies pertaining to this article., (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)
- Published
- 2024
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