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Can lymphatic vascular density be used in determining metastatic spreading potential of tumor in invasive ductal carcinomas?
Pathology Oncology Research : POR 2012 April
Regional lymph node status is the primary parameter determining treatment strategies and prognoses in breast cancer. Lymphatic vessels in primary tumor tissue play a significant role in lymphatic metastasis. The aim of this study was to investigate the correlation of intra- and peritumoral lymphatic microvessel densities (LVD) with prognostic parameters in breast cancer, including lymphatic invasion (LI). Lymphangiogenesis was investigated using D2-40 monoclonal antibody in 69 invasive ductal carcinoma cases who underwent mastectomy and axillary lymph node dissection. Positively stained microvessels were counted at 400× in dense lymphatic vascular foci (hotspots). Tumor LI was established when at least one neoplastic cell cluster was clearly visible inside a D2-40-positive lymph vessel. Relationships were sought between clinicopathological parameters and mean LVD and LI in primary tumor tissue. Peritumoral LVD was markedly higher than intratumoral LVD (p < 0.001). No significant relationship was found between intratumoral LVD and clinicopathological parameters (p > 0.05). However, significant relationships were detected between peritumoral LVD and LVI [H&E] (p = 0.04), number of lymphatic invasion [n/mm2, D2-40] (p = 0.001), tumor size (p = 0.01), lymph node status (p = 0.03), and tumor stage (p = 0.04). The immunohistochemical determination of LI and LVD can contribute to the prediction of a tumor's biological behavior in invasive ductal carcinomas. Peritumoral LVD in primary tumor tissue is closely related to parameters influencing the prognosis of a tumor.
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