Clinical Study of Apatinib Combined With SBRT Therapy in the Treatment of Oligometastasis of Breast Cancer

Inclusion Criteria: 1\. Age: ≥ 18 years old women; 2. Histologically confirmed breast cancer; 3 weeks before enrollment ECOG PS score: 0-2 points; 4. systemic metastasis lesions ≤ 5, Stereotactic body radiotherapy before receiving medical treatment to achieve partial relief or stable disease; 5. Appropriate hematological parameters and liver and kidney function: absolute neutrophil ≧ 1.5 × 109 / L; platelet count ≧ 75 × 109 / L; serum total bilirubin ≦ 1.5 × upper limit of normal; AST and ALT ≦ 2.5 × upper limit of normal (if liver dysfunction) 6. Subject voluntarily joined the study and signed the informed consent form. Exclusion Criteria: 1. After the above image examination of the whole body metastasis lesions ≥ 6; 2. Have received one or more palliative chemotherapy regulators failed; 3. Patients with a high risk of bleeding: active gastric digestive ulcer in the stomach with fecal occult blood (++); those with a history of melena and / or vomiting within 3 months; persons with abnormal coagulation and bleeding tendency; 3-4 grade hypertension patients; 5\. Renal insufficiency 3 and above patients; 6. Hand-foot syndrome ≥ 3 or more patients; 7. There are uncontrolled concomitant diseases in the first 6 months of the study, including unstable angina pectoris, acute myocardial infarction, cerebrovascular accident and so on; 8. Pregnant or breastfeeding patients, or who have fertility without taking contraceptive measures; 9. A history of malignancy, but disease-free survival of more than 5 years; 10. Concurrent with other anti-cancer therapies or other interventional clinical trials; 11. Patients unable to follow the study due to psychological, family-living social reasons