MKI67 and neoplasm: The proportion of G2 tumors and the Ki-67 index, reflecting the tumor grade, were higher in the metastatic group than in the non-metastatic group (75% vs. 25%, p = 0.002; 4.90 (2.36–12.00) vs. 1.49 (0.92–2.43), p = 0.002).