Serum Estradiol (E2) Levels in Breast Cancer Patients During Endocrine Therapy by High Performance Liquid Chromatography-tandem Mass Spectrometry (LC-MS /MS)
Status: RECRUITING
Study type: OBSERVATIONAL
Conditions: Breast Cancer
Interventions: DRUG: AIs|DRUG: OFS+AIs|DRUG: FUL
Sponsor: Sun Yat-sen University