Neoadjuvant Chemotherapy With Pyrotinib, Epirubicin and Cyclophosphamide Followed by Taxanes and Trastuzumab for HER-2+ Breast Cancer

Inclusion Criteria: 1. Female breast cancer patients at the age of \>= 18 years and \<= 70 years who received first treatment； 2. Pathologically confirmed HER2-positive invasive breast cancer（which is defined as the immunohistochemistry score of \> 10% immunoreactive cells being 3+ or in situ hybridization results showing HER2 gene amplification），regardless of hormone receptor status (ER and PR)； 3. According to the 2019 CSCO BC guidelines: When HER-2 positive is used as the standard for preoperative neoadjuvant therapy for breast cancer, the tumor is larger than 2 cm； 4. The Eastern Tumor Collaborative Group (ECOG) has a physical status score of ≤1； 5. The functional level of the main organs must meet the following requirements ： 1) blood routine test: hemoglobin (Hb) ≥ 90g/L;Neutrophils (ANC) ≥ 1.5 × 10\^9/L; platelet count (PLT) ≥ 90 × 10\^9/L; 2) Blood biochemistry: Total bilirubin (TBIL) ≤ 1.5 upper limit of normal value (ULN); Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 1.5 × ULN; alkaline phosphatase ≤ 2.5 × ULN; Urea nitrogen (BUN) and creatinine (Cr) ≤ 1.5 × ULN; 3) Heart color ultrasound: Left ventricular ejection fraction (LVEF) ≥ 55%; 6. Women of childbearing age, tested negative for serum pregnancy test 7 days before randomization，and willing to use appropriate methods during the trial and within 8 weeks after the last administration of the test drug; 7. A volunteer to participate in the study; provision of written informed consent; good compliance and willing to cooperate during the follow-up. Exclusion Criteria: 1. Known history of hypersensitivity to pyrotinib or any of it components; 2. Patients have previously received antitumor treatment or radiation therapy for any malignant tumor (except for cervical carcinoma in situ and basal cell carcinoma that have been cured); 3. Patients underwent major breast cancer-free surgery within 4 weeks and have not fully recovered; 4. Subjects that are unable to swallow tablets,intestinal obstruction or dysfunction of gastrointestinal absorption; 5. Patients with severe heart disease or discomfort who cannot be treated; 6. The patient suffers from mental illness or psychotropic substance abuse and cannot cooperate; 7. Pregnant or lactating women; 8. Less than 4 weeks from the last clinical trial; 9. Patients participating in other clinical trials at the same time 10. The researchers think inappropriate.