“…Considering conventional histological prognostic factors, increased microvessel density had been reported in a number of studies to correlate with larger tumor size (Bolat et al, 2006;Thielemann et al, 2008;Thorat et al, 2009), higher tumor grade (Lee et al, 2002;Valkovic et al, 2002;Bolat et al, 2006;Vogl et al, 2006;Zhou et al, 2006;Thorat et al, 2009) and lymph node metastasis (Weidner et al, 1991;Valkovic et al, 2002;Lee et al, 2002;Bolat et al, 2006). In other studies, however, relationships with these histological prognostic factors could not be validated (Miliaras et al, 1995;Gasparini et al, 1996;Acenero et al, 1998;Fridman et al, 2000;Koukourakis et al, 2003;Ludovini et al, 2003). Similarly, in this study, no significant difference in microvessel density was detected in reference to these histological prognostic factors (p>0.05).…”