A Multicenter, Randomized Clinical Trail Evaluate Effectiveness and Security of Capecitabine or Endocrinotherapy as a Maintenance Therapy Regimen After the 1st-line Chemotherapy With Capecitabine Combine Regimen in Hormone Receptor Positive and HER2 Negative Metastatic Breast Cancer(Overstep)
Status: UNKNOWN
Study type: INTERVENTIONAL
Conditions: Breast Cancer
Interventions: DRUG: Capecitabine|PROCEDURE: endocrine therapy
Sponsor: Zhejiang Cancer Hospital
Collaborators: 307 Hospital of PLA|Fudan University|The Tumor Hospital of Jiangsu Province|Fujian Province Tumor Hospital|Zhejiang University|Sir Run Run Shaw Hospital|Zhejiang Chinese Medical University|Hangzhou Cancer Hospital|Jiangsu Provincial People's Hospital