PCIF1 and cutaneous melanoma: Violin plots showed that the difference expression of PCIF1 had statistical significance in each pathological stages of COAD, KICH, kidney renal clear cell carcinoma (KIRC), liver hepatocellular carcinoma (LIHC), pancreatic adenocarcinoma (PAAD), and skin cutaneous melanoma (SKCM) (Figure 1C).