CXCL1 and melanoma: The sections from melanomas of these patients originate from a cohort of 13 young (< 45 years) and a cohort of 13 old melanoma patients (> 60 years) whose melanomas all immunostained for FSP‐1/GCP‐2 positive fibroblasts in these primary melanomas of old patients, but profoundly less in young patients (Figure 2B).