sentence: This conclusion is based first of all on the biological properties of this growth factor.On literature review , only one study was found comparing VEGF expression in KCOT , DC and RC by Mitrou et al. [ 8] who observed immune reactivity for VEGF in 35 cases out of 37 odontogenic keratocysts ( OKCs ) and all DCs and RCs , as well as adjacent endothelial cells , fibroblasts , and inflammatory cells .