Using 18S rRNA as a control, CD133 mRNA expression levels in each individual cell line derived from patients with poor clinical outcome and short overall survival (FS-4, FS-5, FS-7 and FS-9) were compared with four cell lines derived from melanoma patients with good clinical outcome and longer overall survival (FS-11, FS-12, FS-13, FS-14; Fig. 2). Here, PROM1 is linked to melanoma.