This is a single-center phase II study designed to evaluated the efficacy and safety of fulvestrant in combination with oral vinorelbine in hormone receptor-positive advanced breast cancer

This is a single-group, single-center phase II trial. Patients with hormone-receptor-positive, Her2-negative recurrent or metastatic breast cancer who had not previously received any systemic antitumor therapy for advanced disease were treated with fulvestrant combined with oral vinorelbine as a first-line regimen. Key issues to be addressed in this study: to observe and evaluate the efficacy and safety of fulvestrant combined with oral vinorelbine in the treatment of hormone-receptor-positive and HER2-negative advanced breast cancer. Thirty patients are planned to be enrolled.

Inclusion Criteria:

• Age between 18 and 75 year-old women; Pathologically or cytologically confirmed breast cancer; Hormone receptor-positive
• ECOG score: 0-1, expected survival time ≥ 3months;
• Recurrence after adjuvant therapy or metastatic breast cancer and chemotherapy naïve in the metastatic setting or had one prior regimen for metastatic breast cancer.
• Patients must have measurable disease according to RECIST criteria Version 1.1. Bone metastases lesions were excluded.
• The patients have adequate hematologic and organ function.

Exclusion Criteria:

• Patients with symptomatic brain metastases.
• Patients who are known or suspected to be allergic to the active ingredient or excipients of the investigational drug.
• Received ≥1 standard chemotherapy regimen (excluding endocrine therapy) for advanced breast cancer.
• Participation in other clinical trials within 4 weeks before enrollment.
• Severe cardiovascular disease, including history of congestive heart failure, acute myocardial infarction within 6 months before enrollment, transmural myocardial infarction measured by ECG, uncontrolled arrhythmia, angina requiring therapy, clinically significant valvular heart disease, uncontrolled hypertension.
• Severe or uncontrolled infection.
• Any factors that affect the oral administration and absorption of drugs (such as inability to swallow, gastrointestinal resection, chronic diarrhea and intestinal obstruction, etc.);
• Active malignancy in the past 5 years (other than carcinoma in situ of the cervix or basal cell carcinoma of the skin).
• Patients who are pregnant , breastfeeding ,or refuse to use adequate contraception during the course of participation.
• Need to concurrent other cancer therapy(other than palliative care for non-target lesions).
• Other ineligible conditions according to the researcher's judgment.