PDGFRB and melanoma: Induction of the miR‐143/‐145 cluster paralleled the phenotypic switch associated with the dedifferentiated phenotype, and high expression levels of the two miRNAs are correlated with the mesenchymal MAPKi‐resistant phenotype in all BRAFV600E mutant human melanoma cell lines known to overexpress RTKs including the PDGFRβ.