Angiogenesis and vascular survival ability in ovarian adenocarcinomas

This study was designed to investigate the prognostic relevance of ovarian tumour angiogenesis in terms of tumour angiogenic activity (TAA) and vascular survival ability (VSA), i.e. the ability of newly formed vessels to survive once incorporated into the main tumour mass. TAA was assessed at the edge of the invading tumour, while VSA was evaluated in inner tumour areas, always in comparison with the invading edge. A series of 46 ovarian grade-1 adenocarcinomas of the endometrioid and the serous cell type was assessed. Endothelial cells were revealed after using a standard immunohistochemical technique and the CD31 antibody. Vascular density was, in general, higher at the periphery of the tumour than in the inner tumour areas, although in both cases, a rich vascular supply was associated with a poor survival. By combining counts at the tumour edge versus inner tumour areas (edvin), four groups of tumour vascularity emerged: edvin type 1 (low TAA/low VSA), edvin type 2 (low TAA/high VSA), edvin type 3 (high TAA/low VSA) and edvin type 4 (high TAA/high VSA). Edvin type-4 tumours were related to the most unfavourable prognosis. It is concluded that VSA and TAA are complementary procedures in assessing ovarian tumour vasculature and, therefore, prognosis, and by combining the two parameters, a more precise impression of the state of vascularisation in the ovary is obtained, which may prove useful in designing anti-angiogenic therapies.