Inclusion Criteria:

          -  Age between 18 and 75 year-old women; TNBC

          -  ECOG score: 0-1, expected survival time ≥ 3months;

          -  Pathologically or cytologically confirmed breast cancer;

          -  Anthracycline- / taxane- pretreated (adjuvant, neoadjuvant) breast cancer patients who
             have failed from 1-3 standard chemotherapies after recurrence and metastasis;

          -  According to RECIST 1.1, exist at least ≥1 measurable lesion(CT >1cm，other examination
             >2cm);

          -  The patients have enough organ function. The laboratory test indexes must comply with
             the following requirements:

               -  Blood routine: neutrophil≥1.5G/L, platelet count ≥80G/L, hemoglobin ≥90g/L

               -  Liver function: serum bilirubin ≤ 1.5 times the upper limit of normal value; ALT
                  and AST≤2.5 times the upper limit of normal value; ALT and AST≤5 times the upper
                  limit of normal value when liver metastasis

               -  Renal function: serum creatinine ≤ 1.0times the upper limit of normal value,
                  creatinine clearance >50ml/min（Cockcroft-Gault formula)

          -  Women of child-bearing age should be carried out pregnancy test (serum or urine)
             within 7 days before recruit, the results should be negative; and are willing to adopt
             the appropriate methods of contraception during the trial and 8 weeks after last
             administration；

          -  Can swallow oral drugs;

          -  The patients have good compliance to the therapy and follow-up to be scheduled and are
             able to understand the study protocol and sign the Informed Consent Form.

        Exclusion Criteria:

          -  The patients in pregnancy or lactation growth period and did not take effective
             contraception;

          -  The patients who received ≥4 chemotherapies after recurrence and metastasis; involved
             in other clinical trials four weeks prior to the start of the study;

          -  The patients with a variety of factors that affect the oral administration and
             absorption of drugs;

          -  Prior treatment with etoposide or antiangiogenic TKI (subjects with prior use of
             antiangiogenic macromolecules such as bevacizumab are allowed to be enrolled);

          -  The patients have uncontrollable mental illness；

          -  Serous cavity effusion (such as pleural effusion and ascites) with clinical symptoms
             requiring clinical intervention or stable time less than 4 weeks;

          -  The patients who had serious adverse effect to oral etoposide or were allergic to
             etoposide.

          -  The patients who have only bone metastasis without other measurable lesion;

          -  The patients experience severe cardiovascular diseases;

          -  The patients experience severe upper gastrointestinal ulcer or malabsorption syndrome.

          -  Abnormal bone marrow functions(neutrophil<1.5G/L, platelet count <75G/L, hemoglobin
             <90g/L);

          -  Abnormal renal function(serum creatinine > 1.5 times the upper limit of normal value);

          -  Abnormal liver function(serum bilirubin ≤ 1.5 times the upper limit of normal value);

          -  The patients have uncontrollable brain metastasis;

          -  Active or uncontrolled infection requiring systematic treatment (except simple urinary
             tract infection or upper respiratory tract infection) during the 2 weeks or 2 weeks
             prior to enrollment;

          -  Previous or concurrent history of other malignant tumors.Except for the cured skin
             basal cell carcinoma and cervical carcinoma in situ;

          -  The patients do have good compliance to the therapy.