This multi-center, open-label, phase II randomized controlled trial is to evaluate the efficacy of docetaxel(T) combined with metronomic cyclophosphamide/capecitabine (mCX) followed by fluorouracil /epirubicin/cyclophosphamide (FEC) versus T followed by FEC as neoadjuvant chemotherapy in treating women with triple negative breast cancer (TNBC), and to study the anti-tumor immune effect of metronomic neoadjuvant chemotherapy. 186 stage M0 TNBC patients who had a primary tumor > 2cm by imaging or an axillary lymph node > 2cm by imaging are randomly enrolled to receive neoadjuvant T combined with mCX (3 cycles) followed by FEC (3 cycles) or T (3cycles) followed by FEC (3 cycles) before surgery. The primary end point is pathological complete response (pCR) rate, and the secondary end points include: clinical response rate, toxicities, breast-conserving rate, Ki67 and CD31 reduction rate, changes in the percentages of peripheral blood or tumor microenvironmental regulatory T cells (Treg), T helper cells (Th), CD8+ T cell, and tumor-specific CTL, and changes in tumor microenvironmental immune cytokines. Once there is a significant statistical difference in terms of pCR rate between two groups, 3-year disease-free survival (DFS) and 3-year overall survival (OS) will be included in the secondary end points. The aims of this study are to determine whether the neoadjuvant T combined with metronomic CX followed by FEC can significantly increase the pCR rate in TNBC with acceptable toxicity, and to explore the anti-tumor immune effect of metronomic neoadjuvant chemotherapy.

Inclusion Criteria:

• The patients signed the written informed consent

• The patients present with non-metastatic unilateral invasive ER-negative (IHC<10%), PR-negative(IHC<10%), HER2-negative breast cancer with a primary breast tumor > 2cm by imaging or an axillary lymph node > 2cm by imaging.

• 18 years old< age < 70 years old.

• The patients have no history of hormone therapy, chemotherapy, breast cancer surgery and radiotherapy.

• The patients have normal cardiac functions by echocardiography.

• The patients' ECOG scores are ≤2.

• The patients can swallow pills.

• The results of patients' blood tests are as follows:

  • Hb≥90g/L;
  • WBC≥4E+9/L;
  • Plt≥100E+9/L;
  • Neutrophils≥1.5E+9/L;
  • ALT and AST ≤ triple of normal upper limit;
  • TBIL ≤ 1.5 times of normal upper limit;
  • Creatinine ≤ 1.5 times of normal upper limit.

Exclusion Criteria:

• The patients have other cancers at the same time or have the history of other cancers except controlled skin basal cell carcinoma or skin squamous cell carcinoma or carcinoma in situ of cervix uterus;
• The patients have active infections that were not suitable for chemotherapy;
• The patients have severe non-cancerous diseases.
• The patients have bilateral breast cancers or male breast cancers or inflammatory breast cancers.
• The patients are undergoing current administration of anti-cancer therapies, or are attending other clinical trials.
• The patients are in some special conditions that they cannot understand the written informed consent, such as they are demented or hawkish.
• The patients have allergic history or contraindication of any of the interventional drugs.