CMA1 and cholesteatoma: The results of our study indicated that the Ki-67 proliferative index of the cholesteatoma epithelium, the number of CD117-positive mast cells, the number of chymase-positive mast cells, the number of tryptase-positive mast cells, and the number of microvessels were not statistically significant in comparing the groups with mild bone erosion and advanced bone erosion.