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Kaplan–Meier curves for 3-year melanoma-specific death in patients with melanoma of unknown primary (MUP) and melanoma with known primary MKP) who underwent treatment with immune checkpoint inhibitors. Log-rank test was statistically significant (P = .0112) with a hazard ratio for MUP patients of 0.29 (95% confidence interval of 0.11 to 0.75).
