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Mitotically active nevus and Nevoid Melanoma: A clinicopathological and molecular study

Mesbah Ardakani, N., Singh, S., Thomas, C., Van Vliet, C., Harvey, N.T., Calonje, J.E. and Wood, B.A. (2020) Mitotically active nevus and Nevoid Melanoma: A clinicopathological and molecular study. The American Journal of Dermatopathology, 43 (3). pp. 182-190.

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The distinction between nevoid melanoma and a mitotically active nevus can be challenging at the microscopic level. In this study, we performed cytogenetic testing on a cohort of 25 mitotically active melanocytic proliferations resembling common melanocytic nevus from 25 patients. Based on cytogenetic findings, the lesions were classified as “nevoid melanoma” (n = 13) or “mitotically active nevus” (n = 12). Subsequently, we compared the clinicopathological features between these 2 groups. Nevoid melanomas occurred in older patients (P = 0.007); however, there were no significant differences in gender, size, or anatomical distribution between the 2 groups. Histologically, deep/marginal mitoses (P = 0.006), lack of maturation with depth (P = 0.036), and pseudo-maturation (P = 0.006) were significantly more common in nevoid melanomas. Immunohistochemically, complete loss of p16 was an important divisive feature (P = 0.0004), seen in 70% of nevoid melanomas, and highly correlated with loss of CDKN2A gene (chromosome 9p21). Our findings suggest that such reproducible immunomorphological differences can be of value in distinguishing nevoid melanoma from mitotically active nevus. Nevoid melanomas demonstrated a spectrum of chromosomal aberrations similar to those seen in common subtypes of melanoma, which can serve as a powerful adjunct diagnostic tool in morphologically challenging lesions.

Item Type: Journal Article
Murdoch Affiliation(s): College of Science, Health, Engineering and Education
Publisher: Wolters Kluwer
Copyright: © 2020 Wolters Kluwer Health
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