Invasive capacity and proliferative activity of cutaneous melanoma and the epigenetic factor

Abstract

The invasive capacity and proliferative activity of the tumor are evaluated by immunohistochemical measurement of N-cadherin and Ki-67 expression in patients with cutaneous melanoma with and without BRAF oncogene V600E mutation. The B-Raf is a serine/threonine kinase involved in the Ras-Raf-MEK-MAPK signal pathway. This signal cascade normally regulates the cell proliferation andfunctioning, controlled by growth factors and hormones. The BRAF gene mutation is detected in 40-60% melanomas, predominantly in the tumors located in the closed parts of the body. The expression of N-cadherin is liable to increase in BRAF+ patients, this, in turn, presumably indicating more marked invasive characteristics of tumors in this patient population. The expression of Ki-67 virtually does not differ in patients with different BRAF status (p>0.05), this indicating no differences in the proliferative activity in these patients.

Keywords

Ki-67 / melanoma / cell proliferation / tumor invasion / N-cadherin

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