A phase II study of irinotecan in 3 line or more therapy in local recurrence or metastatic breast cancer. Evaluate the effect and safety of irinotecan in local recurrence or Metastatic breast cancer patients who recieved anthracycline or taxane drugs. The primary endpoint is Disease Control Rate and Progression free survival. The second endpoint is 3 or 4 grade Adverse Events 、overall survival. irinotecan 100mg/m2,iv,day1,day8,every 3cycles.If no AE happens, increase irinotecan dose to125mg/m2 at the second cycle.All the patients will recieve this therapy till disease progress or other occurrence of withdrawal standards.
