PDGFRB and melanoma: Finally, when the correlation index was computed on melanoma data reported in Figure 1E, PDGFR-alpha expression levels show a significant positive correlation with CXCL10/IP10 levels (p = 0.002) while PDGFR-beta levels show no significant correlation (p = 0.6), further supporting a specific functional link of PDGFR-alpha with CXCL10/IP10.