To investigate the relationship between prognosis and co-expression of PROM1 and PROM2, we retrieved clinical prognosis data from patients with various types of cancers, including breast, kidney, brain, ovarian, lung, and skin cancers, using OncoLnc, which accesses data from TCGA (Fig. 4c and Supplementary Fig. S7). Here, PROM2 is linked to skin cancer.