Purpose To investigate the effect of CXCL12/CXCR4 and MMP-2 on the biological behavior of triple-negative breast cancer. Method CXCR4-siRNA and pc DNA3. 1-CXCR4 were transient transfected of in MDA-MB-231 cell line by liposome,RNA and protein were extracted. The mRNA and protein expressions of CXCR4,CXCL12 and MMP-2 were detected by RT-PCR and Western blot respectively. And the migration and proliferation of the transfected cells were detected by Wound-healing assay and MTT assay. Result The experiment of R...