Mitotic cyclins and cyclin-dependent kinases in melanocytic lesions.
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.
Department of Pathology and Laboratory Medicine, Albany Medical College and Samuel S. Stratton Veterans Administration Medical Center, NY 12208, USA.
T A
TA
Tran
J S
JS
Ross
J A
JA
Carlson
M C
MC
Mihm
D016203:CDC2 Protein Kinase / Q000032:analysis*; D019925:Cyclin A / Q000032:analysis*; D019926:Cyclin B / Q000032:analysis*; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000032:analysis; D008544:Melanocytes / Q000737:chemistry*; D008545:Melanoma / Q000737:chemistry*; D008938:Mitosis; D009508:Nevus, Pigmented / Q000737:chemistry; D012867:Skin / Q000378:metabolism; D012878:Skin Neoplasms / Q000737:chemistry*
D019925:Cyclin A; D019926:Cyclin B; D019394:Ki-67 Antigen; D016203:CDC2 Protein Kinase