PDGFRA and melanoma: No significant effect was observed as to the PDGFRa protein level neither by 1,25(OH)2D3, nor by cediranib under the experimental conditions used in RPMI-7951 and SK-MEL-28 melanoma cells (Figures 6B, H); what is more, we did not detect any PDGFRa protein product in MNT-1 melanoma cells (Figure 6E).