Lymphatic vessel density in pulmonary adenocarcinoma immunohistochemically evaluated with anti‐podoplanin or anti‐D2‐40 antibody is correlated with lymphatic invasion or lymph node metastases

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<jats:p>In lung cancers, lymph node metastasis of cancer cells is one of the most important prognostic factors, and lymphatic vessel invasion (LVI) is very important in the stage preceding lymph node metastases. Recently, it has been reported that lymphatic vessel density (LVD) is associated with lymph node metastasis. The aim of the present study was to evaluate the relationship between LVD and LVI based on the immunohistochemical expression of podoplanin or D2‐40, which are new specific markers for lymphatic endothelium. Using 76 cases of pulmonary adenocarcinoma, the relationship between LVD and LVI, lymph node metastases, vascular endothelial growth factor C (VEGF‐C), VEGF‐D or hepatocyte growth factor (HGF) expression was investigated. LVD was significantly associated with LVI, lymph node metastases and VEGF‐D expression. LVI was also associated with lymph node metastases, histological subtype, VEGF‐C or VEGF‐D expression. High LVD, induced by VEGF‐C or VEGF‐D expression of cancer cells, is a good indicator of lymphatic metastases and LVI in pulmonary adenocarcinoma.</jats:p>

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