MKI67 and melanoma: The Ki67 index was positively correlated with Breslow thickness (r = 0.25; p = 0.009), presence of ulceration (r = 0.31; p = 0.001), mitotic rate (r = 0.34; p = 0.0004), and TNM stage (r = 0.3; p = 0.001) and related to the melanoma histological type (r = −0.28; p = 0.003).