Maintenance Treatment With Eribulin Mesylate Versus Observation in Triple Negative Breast Cancer Patients

Inclusion Criteria:

* The patient volunteers and signs an informed consent form;
* Age ≥18 years old, female;
* The patient was diagnosed as triple-negative breast cancer by histopathology (ER negative (IHC ER positive percentage \<1%), PR negative (IHC PR positive percentage \<1%), HER2 negative (IHC-/+ or IHC++ but FISH/CISH- )), and there is no evidence of metastasis;
* Patients underwent radical or breast conserving surgery combined with sentinel lymph node biopsy for primary breast cancer. Margins free of disease and ductal carcinoma in-situ (DCIS) are required. Lobular carcinoma is not considered a positive margin.
* For patients who have previously received neoadjuvant therapy for triple-negative breast cancer containing anthracyclines and taxanes, the postoperative efficacy evaluation did not reach pathological complete remission (non-PCR), that is, the primary breast and/or metastatic regional lymph nodes still have histological evidence of malignant tumors other than carcinoma in situ;
* For patients who have not received neoadjuvant therapy for triple-negative breast cancer, ≥1 ipsilateral axillary lymph nodes have pathological tumor involvement after surgery. Or the patient's postoperative lymph nodes are negative, but at least meet one of the following conditions:

  1. Primary invasive tumor size\> 2cm in pathology;
  2. Ki-67 index of untreated breast tissue\>30%;
  3. The comprehensive score is at least 8 points (Elston and Ellis 1991) according to the improved Bloom-Richardson grading system (also known as the Nottingham scale), which belongs to the 3rd level;
* Physical condition ECOG PS: 0-1;
* Previously received adjuvant chemotherapy consisting of a minimum of 6 courses with anthracyclines combined taxanes;
* Time window between end of adjuvant chemotherapy and study randomization must be less than 8 weeks. In patients receiving adjuvant radiotherapy, time window allowed between last session and randomisation is 4 weeks;
* Laboratory tests meet the following criteria:

  1. Bone marrow function: absolute count of blood neutrophils (ANC) ≥1.5×109/L; platelet (PLT)≥100×109/L; hemoglobin (HB)≥90g/L;
  2. Liver function: serum total bilirubin (STB), combined bilirubin (CB) ≤ upper limit of normal (ULN) \*1.5; alanine aminotransferase (ALT), aspartate aminotransferase (AST) ≤ULN\*2.5;
  3. Renal function: serum creatinine (Cr) ≤ ULN; endogenous creatinine clearance (Ccr) ≥ 60 ml / min (calculated using the Cockcroft-Gault formula).

Exclusion Criteria:

* Patients with metastatic breast cancer (including contralateral axillary lymph nodes), inflammatory carcinomas;
* Previous breast cancer history (except for ipsilateral DCIS that only received local treatment ≥5 years ago), malignant tumors of other histological origins (except for non-melanoma skin cancer or cervical carcinoma in situ) unless the patient's tumor had been completely alleviated and had not received treatment for at least 5 years before the enrollment date;
* Major surgery within 4 weeks prior to enrollment, or surgical wounds have not healed;
* Embolization and bleeding occurred within 4 weeks before enrollment;
* Severe cardiovascular disease, including hypertension (BP≥160/95mmHg) uncontrolled by medical treatment, unstable angina, history of myocardial infarction in the past 6 months, congestive heart failure\>NYHA II, severe heart rhythm Abnormalities and pericardial effusions;
* Severe infection requires intravenous antibiotic, antifungal or antiviral treatment;
* Suffering from mental illness, poor compliance;
* Researchers believe that it is not suitable for inclusion.