SF3B1 and melanoma: Melanomas with SF3B1 mutations had a similar mitotic rate when compared to non-SF3B1 mutated cases (15.6±4.4 vs 15.5±2.54 mitoses/mm2) but were more often ulcerated (SF3B1: 6 out of 6 cases vs non-SF3B1: 10 of 16 cases with ulceration data), and were comprised of heterogeneous cell types.