Figure 1. Univariable Analysis of Patients With Metastatic Cutaneous Melanoma Treated With Immune Checkpoint Inhibitors by American Joint Committee on Cancer Eighth Edition Metastasis (M) Staging.

M1a indicates patients with nonregional lymph nodes and/or skin or soft tissue lesions; M1b, patients with lung metastases; M1c, patients with all other visceral sites of disease (including liver involvement); M1d, patients with central nervous system metastases. Vertical line marks 1-year survival.