LEF1 and melanoma: Following the Wnt binding to its receptor, AKT kinase undergoes phosphorylation, which results in β-catenin translocation to the nucleus and activation of the expression of genes promoting the invasion of melanoma cells such as encoding LEF-1 (lymphoid enhancer binding factor 1)—a transcription factor stimulating the migration, angiogenesis, and metastasis of cancer cells [139].