RESULTS ZB accounted for 370 tumors and Penn accounted for 415 tumors [Supplementary Table II, available via Mendeley at https://doi.org/10.17632/jhn5br9kbg. 1]. The cohorts did not statistically differ with regard to LR, NR, and DR rates. In addition, melanoma- specific death and gender were similar between the cohorts. The cohorts did differ with regard to follow- up duration (mean 4.3 years for ZB vs mean 2.9 years for Penn), age at melanoma diagnosis (71.6 years ZB vs 67.4 years Penn), tumor size (1.97 cm ZB vs 2.24 cm Penn), Breslow thickness (0.90 mm ZB vs 0.77 mm Penn), and proportion of overall death(0.189 ZB vs 0.113 Penn). Overall death, melanoma specific death, as well as LR, NR, and DR between the cohorts were not significantly different when compared with the Mantel-Cox test (P = .203, P = .589, .352, 0.489, 0.176). the main results