CXCR4 expression in early breast cancer and risk of distant recurrence

The Oncologist
F AndreM Cristofanilli

Abstract

Chemokine receptor 4 (CXCR4) has been demonstrated to have a critical role in the early metastatic process. The aim of this study was to evaluate the prognostic value of CXCR4 expression in primary breast tumors and describe correlations with the occurrence of metastasis in organs expressing the CXCR4 ligand stromal cell-derived factor 1 (i.e., liver, lung, brain, and bone). CXCR4 expression in primary breast tumors was evaluated by immunohistochemistry in 823 patients included in two prospective clinical trials. CXCR4 expression was considered positive when >1% of tumor cells were stained. The prognostic value of CXCR4 expression was assessed by a Cox regression model adjusted for clinical characteristics. We assessed the association of CXCR4 expression with the rate of distant metastasis to specific organ sites. CXCR4 was expressed in 92 of 794 primary tumors (12%). CXCR4 expression was not associated with clinical characteristics. CXCR4 was not prognostic for overall survival and showed a nonsignificant trend toward a higher risk for distant metastasis. CXCR4(+) tumors showed a significantly higher risk for bone metastasis. The 10-year incidences of bone metastases were 23% (13.6%-32.6%) and 12% (9.7%-15%) in CXCR4(+) and CX...Continue Reading

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