Check update pattern of tumorigenic vasculature signature based on MMP9 and CXCR4 expression in locally advanced breast cancer

Context: Locally advanced breast cancers (LABC) are the most common women malignant tumors. Appropriate vasculature is required for tumor growth support, formed by involving protein signaling, including matrix metalloprotein 9 (MMP9) and C-X-C chemokine receptor type 4 (CXCR4). Neoadjuvant chemotherapy (NAC) administration to inoperable LABC commonly exhibits a positive response, although recurrences may be encountered in a few cases. Aims: To evaluate the MMP9 and CXCR4 expression shifting after the NAC procedure to establish evidence of the anti-angiogenic effect of NAC, which encourages knowledge of tumor size reduction pathways in LABC. Methods: Observational designs were conducted in this study. Tissue specimens before and after NAC were collected from 45 LABC-enrolled subjects. The targeted protein expression was analyzed by immunohistochemistry, and stained sections were classified according to the percentage of nuclear-stained tumor cells. Clinicopathological features of LABC were recorded. Tumor size was measured by Vernier caliper before and after NAC. Results: The results showed the nuclear expression of MMP9 and CXCR4 protein were observed in all tissue specimens. The expression of MMP9 and CXCR4 tended to decrease after the NAC but was not statistically significant for MMP9. There was a significant correlation between expression levels of CXCR4 and tumor size reduction (p<0.001) but not for MMP9. Conclusions: The results of this study demonstrate the anti-angiogenic effect of NAC by inhibiting MMP9 and CXCR4, which may be integrated with tumor size reduction in LABC. Further studies are required to highlight the possibility of recurrence following inhibition of MMP9 and CXCR4 by NAC.