The association between vascular endothelial growth factor-C, its corresponding receptor, VEGFR-3, and prognosis in primary breast cancer: a study with 193 cases.

Lymphangiogenesis plays an important role in several normal and pathological conditions, such as wound healing, pathogen infection, inflammation or the metastasis formation of endothelial malignancies. Vascular endothelial growth factor-C (VEGF-C) and VEGF-D are important and specific regulatory factors for lymphatic endothelial proliferation and lymphangiogenesis. Both growth factors mediate their biological activity mainly by VEGF receptor-3 (VEGFR-3, Flt-4). In this study, we measured intratumoral levels of VEGF-C and VEGFR-3 through enzyme-linked immunosorbent assay (ELISA) in 193 primary breast cancer tissues and examined their prognostic values. A significant correlation was found between the VEGF-C and VEGFR-3 protein levels. High VEGF-C levels were associated with low-grade tumors and a smaller size. Univariate analysis showed that high VEGF-C was significantly associated with a favourable prognosis for disease-free survival (DFS) and overall survival (OS). No significant prognostic value of VEGFR-3 was detected. Multivariate analysis confirmed the independent prognostic value of VEGF-C. The intratumoral VEGF-C level is a significant prognostic indicator of primary breast cancer. An investigation of the mechanisms of VEGF-C protein processing in human cancer tissue should be carried out in the future.