PECAM1 and skin basal cell carcinoma: Median peritumoural- (PT-) CD31-Chalkley count was 8.33 (SD = 1.98) points for SCC and 5.81 (SD = 1.05) for BCC (P < 0.001) (Figure 1(a)), while median PT-CD105-Chalkley count was 7.84 (SD = 1.76) points for SCC and 5.19 (SD = 1.19) for BCC (P < 0.001) (Figure 1(b)).