Chemokine receptors CCR6 and CCR7 have been reported to play important roles in T cell migration and organ-specific metastasis of various tumors. The expression levels of CCR6 and CCR7 in tumor tissues in patients with lymph node metastases than those without lymph node metastases. CCR6 and CCR7 expressions were also detected in metastatic lymph nodes. CCR6(+) subset of CD4(+) regulatory T cells, a newly characterized subset of Tregs, has been reported to contribute to local immune inhibition. There is a new subset of tumor-resident Tregs, CCR6(+) Tregs, may be dominantly responsible for the immunosuppression in tumor immunity and a potential predictor of the poor prognosis of breast cancer.