Welsch M, Marszalek R, Young M, Zhu J, Clarke L, Helm K. Seasonal variation in dysplastic naevi.
Clin Exp Dermatol 2012;
37:554-6. [PMID:
22712861 DOI:
10.1111/j.1365-2230.2012.04354.x]
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Abstract
There is a relationship between sunlight and the development of melanocytic neoplasms. Because the incidence and excision of melanocytic neoplasms varies according to season, we sought to determine if dysplasia and/or intraepidermal melanocytic expression differed in a cohort of dysplastic naevi (DN) removed in January compared with a similar cohort removed in August. The DN were graded based on the degree of dysplasia, and the number of intraepidermal melanocytes were counted after immunohistochemical staining with HMB-45 and Melan-A. There was no seasonal difference in the grading of the dysplastic naevi in either season (P = 0.08). Comparing 85 cases from August and 86 from January, there was a larger number of Melan-A-positive melanocytes in the August samples (P < 0.02), and a larger number of HMB-45-positive melanocytes in January (P < 0.01). This difference may be related to seasonal variations such as exposure to ultraviolet light exposure; however, there was no difference between the two groups in the degree of atypia seen.
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