Frequent mitotic activity in banal melanocytic nevi uncovered by immunohistochemical analysis

Glatz, Katharina and Hartmann, Christoph and Antic, Milos and Kutzner, Heinz. (2010) Frequent mitotic activity in banal melanocytic nevi uncovered by immunohistochemical analysis. American journal of dermatopathology, Vol. 32, H. 7. pp. 643-649.

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Official URL: http://edoc.unibas.ch/dok/A6005694

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The presence and distribution of mitotic figures is an important discriminatory parameter in the assessment of melanocytic lesions. We evaluated the number and distribution of mitotic figures in 353 randomly collected melanocytic nevi of various subtypes by hematoxylin and eosin (H;E) staining and immunohistochemically with the 2 mitotic markers Phospho-Histone H3 Ser28 (PHH3) and MPM2. At least 1 mitotic figure was present in 19.5%, 31.3%, and 42.8% of H;E-, PHH3-, and MPM2-stained lesions, respectively. In common compound nevi, the mean number of dermal mitoses amounted to 0.024/mm dermal surface area in the H;E staining (PHH3: 0.061; MPM2: 0.087) and to 0.175/mm in Spitz nevi (PHH3: 0.325; MPM2: 0.45). Nevi exhibiting mitotic figures were significantly more frequent in the youngest age group (0-20 years) than in patients older than 50 years (P > 0.0001). In the upper half of the dermis, mitotic activity was roughly 3 times as frequent as compared with the lower half. Clusters of mitotic figures within the dermis were not observed. Mitotic activity in obviously benign melanocytic nevi is not rare even in the deep dermal part. More than 2 mitotic figures per lesion can usually be explained either by the nevus subtype, young patient age, traumatization, or inflammation. PHH3 and MPM2 are a valuable diagnostic adjunct in the evaluation of melanocytic tumors allowing more sensitive and faster recognition of mitotic figures and their distribution.
Faculties and Departments:03 Faculty of Medicine > Bereich Querschnittsfächer (Klinik) > Pathologie USB
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Querschnittsfächer (Klinik) > Pathologie USB
UniBasel Contributors:Glatz-Krieger, Katharina
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Lippincott Williams & Wilkins
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:04 Jan 2013 08:37
Deposited On:04 Jan 2013 08:34

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