Mitotic cyclins and cyclin-dependent kinases in melanocytic lesions

Hum Pathol. 1998 Oct;29(10):1085-90. doi: 10.1016/s0046-8177(98)90418-x.


Recent evidence has implicated cyclins and cyclin-dependent kinases in the evolution and progression of various malignancies. We studied the immunohistochemical expression of cyclin A, cyclin B, and cyclin-dependent kinase p34cdc2 in a broad spectrum of benign and malignant melanocytic lesions. Formalin-embedded, parrafin-fixed tissue sections from 66 malignant melanomas (MM) and 60 benign nevi were examined for the expression of these cell-cycle proteins. The results were compared with the standard proliferative marker Ki-67 and mitotic index. MM showed significantly higher immunoreactivity for cyclin A, cyclin B, p34cdc2, and Ki-67 compared with benign nevi. Cyclin A, p34cdc2, and Ki-67 displayed strong co-expression in MM. Overexpression of cyclin A and p34cdc2 correlated with histological type, mitotic activity, Ki-67 index, tumor thickness, Clark's level, and clinical outcome in MM. In invasive MM, increased immunostaining of cyclin A and Ki-67 were associated with decreased patient survival. These findings indicate potential roles of mitotic cyclins and cyclin-dependent kinases in the pathogenesis and progression of malignant melanoma.

MeSH terms

  • CDC2 Protein Kinase / analysis*
  • Cyclin A / analysis*
  • Cyclin B / analysis*
  • Humans
  • Immunohistochemistry
  • Ki-67 Antigen / analysis
  • Melanocytes / chemistry*
  • Melanoma / chemistry*
  • Mitosis*
  • Nevus, Pigmented / chemistry
  • Skin / metabolism
  • Skin Neoplasms / chemistry*


  • Cyclin A
  • Cyclin B
  • Ki-67 Antigen
  • CDC2 Protein Kinase