SMO and skin basal cell carcinoma: In contrast, SMO expression correlated with Ki67 index in every group: BCC (R2 = 0.82, P < 0.001), SCC (R2 = 0.52, P = 0.005), SEB (R2 = 0.61, P = 0.002), and all tumors combined (R2 = 0.53, P < 0.001, Fig. 3).