Figure 4. Validation of signature genes in patients with metastatic cutaneous melanoma undergoing chemotherapy and immunotherapy. (A and B) Western blot results of signature genes and t-test comparison results of gray values between the two groups. (C) T-test comparison results of the relative expression levels of signature genes in real-time qPCR between the two groups. (D) Hematoxylin-eosin (HE) staining: normal skin tissue, tumor tissues of metastatic melanoma patients receiving chemotherapy and immunotherapy. *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001.