CXCL6 and melanoma: To further confirm that GCP‐2 and ENA‐78 silencing in replicative senescent fibroblasts is reliably maintained in melanomas originating from the injection of replicative senescent fibroblasts together with A375KDN melanoma cells into SCID mice, immunostaining for GCP‐2 or ENA‐78 staining was performed on sections of explanted melanomas.