MKI67 and Behcet disease: Furthermore, it was found through partition of chi-square that the positive expression rate of Ki-67 in the CSCC group was higher than that in the AK group, with a statistically significant difference (χ2 = 9.32, P < 0.01), while it had no statistically significant difference between the CSCC group and the BD group (χ2 = 2.09, P > 0.05), and between the BD group and the AK group (χ2 = 1.93, P > 0.05).