<qa>  How many cells will be counted in the study?Using this approach, each section prepared by the immunohistochemical method will be evaluated under the light microscope. The number of cells in the study will be counted at 400x magnification. A 10-field count will be performed in the different situations evaluated. The mean number of cells present in this 10-field count represented an area of 0.094 mm2. By means of a simple rule of three, the number of cells will be converted into 1 mm2 counts. The cell count will be expressed as numerical density, i.e. number of positive cells per square millimeter of epithelium. 