NFKB1 and melanoma: The basal values were lower in fibroblasts than in melanoma cells, and the variations in intercellular NF-kβ concentration were not dose-dependent in BJ cells, although a clear tendency of NF-kβ drop was observed, opposite to A375 cells where 50 μM subcytotoxic and 100 μM cytotoxic concentrations both conducted to NF-kβ increase (Figure 5).