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Immunoexpression of B7-H3 in endometrial cancer: relation to tumor T-cell infiltration and prognosis

Immunoexpression of B7-H3 in endometrial cancer: relation to tumor T-cell infiltration and prognosis

Gynecologic Oncology 124(1): 105-111

B7-H3, a member of the B7 family of immune regulatory ligands regulates T cell-mediated peripheral immune response. The purpose of this study was to correlate the expression of B7-H3 and number of lymphocytes in patients with endometrial cancer. A total of 107 patients with primary endometrial carcinoma (type I/endometrioid, n=81; type II, n=18) and endometrial hyperplasia (n=8) were investigated. Expression of B7-H3 in endometrial hyperplasia, endometrial carcinoma, and the endothelium of tumor-associated vasculature was assessed using immunohistochemistry from paraffin-embedded tissue blocks. Detection of CD8-positive tumor-infiltrating lymphocytes (TIL) and CD8-positive tumor-associated lymphocytes (TAL) was correlated with the expression of B7-H3. Patients with high grade tumors and patients with type II carcinomas expressed significantly more B7-H3 than low grade and endometrioid tumors (p=<0.0001 and p=0.0001, respectively). The expression of B7-H3 in the endothelium of identified vasculature in the tumor specimens showed similar results with strong relation to high grade tumors (p=0.001) and type II carcinomas (p=0.004). We found a significant correlation between B7-H3 expression on cancer cells and tumor T-cell infiltration (TIL) (p=0.017). In a univariate survival analysis, overexpression of B7-H3 in tumor cells was associated with shortened overall survival (p=0.005). B7-H3 is overexpressed on cancer cells and in the endothelium of tumor-associated vasculature in high grade tumors (G3) and type II carcinomas. B7-H3 expression on cancer cells is correlated with the number of T cells infiltrating the tumor. Endometrium tumor development and progression may be associated with downregulation of T-cell-mediated antitumor immunity through B7-H3.

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Accession: 036227284

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PMID: 21982044

DOI: 10.1016/j.ygyno.2011.09.012

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