The available data suggest that microvessel density (MVD) evaluation may be capable of discriminating between benign and malignant SGTs, while the use of CD105 antibody seems to be the most suitable. Substantial evidence also suggests that MVD and VEGF expression could be used as prognostic factors in malignant SGTs. Although several agents have shown antiangiogenic activities in adenoid cystic carcinoma cells and xenograft tumors, limited effectiveness in the existing clinical trials was noted. Further studies are strongly recommended for the validation of already well-known and the identification of novel prognostic and predictive angiogenic markers. There is also a strong demand for relatively larger cohorts, homogenous samples referring to same histological SGT subtypes and including an equivalent number of low- and high-grade SGTs.
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