CD274 and melanoma: Patients with coexistent BP and melanoma were significantly older at the onset of BP (80.4[10.2] vs. 76.6[14.4]; P = 0.001), had lower body mass index (25.8 [3.5] vs. 27.9 [6.1]; P < 0.001), and higher exposure to PD-1/PDL-1 inhibitors (1.2% vs. 0.1%; P = 0.004).