Pyrotinib Combined With Trastuzumab and Chemotherapy Neoadjuvant Therapy for HER2-positive Breast Cancer

Inclusion criteria

• Female patients aged 18-75 years;
• Her2-positive breast cancer confirmed by pathology;
• invasive breast cancer confirmed by histology, Tumor stage: early stage (T1c-3, N0-1, M0) or locally advanced stage (T2-4, N2, N3, M0);
• ECOG PS: 0-1 score;
• Plan to undergo the final surgical removal of breast cancer, i.e. breast conserving surgery or total mastectomy, sentinel lymph node (SN) biopsy or axillary lymph node dissection (ALND)
• Normal function of major organs means that the following criteria are met:
• Blood test neutrophil (ANC) \>=1.5x10\^9/L; Platelet count (PLT) \>=90x10\^9/L; Hemoglobin (Hb) \>=90g/L; (2) Total bilirubin (TBIL) \<=1.5 upper limit of normal (ULN); Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) \<=1.5xULN; Alkaline phosphatase \<=2.5xULN; Urea nitrogen (BUN) and creatinine (Cr) \<=1.5xULN; (3) Left ventricular ejection fraction (LVEF) \>=55%; (4) The QT interval (QTcF) corrected by Fridericia method was less than 470msec in 12-lead ECG; 7. For women who have not undergone menopause or surgical sterilization: consent to abstinence or use an effective contraceptive method (during treatment and for at least 7 months after the last dose in the study treatment); 8. Volunteer to participate in this study, sign the informed consent, have good compliance and be willing to cooperate with follow-up.

Exclusion criteria

• Known allergic history of the drug components of this protocol;
• Previous or co-existing other malignant tumors, except cured basal cell carcinoma of the skin and carcinoma in situ of the cervix;
• Participated in clinical trials of other antitumor drugs within four weeks;
• Stage IV (metastatic) breast cancer;
• Multiple factors affecting oral medication (e.g., inability to swallow, post-gastrointestinal resection, chronic diarrhea, and intestinal obstruction);
• A history of congestive heart failure (CHF) or uncontrolled heart disease (angina, arrhythmia, hypertension);
• Patients with active infection and severe mental illness;
• Pregnant or lactating patients;
• Patients with allergies or known history of allergies to the drug components of this protocol; A history of immunodeficiency, including being HIV positive, or having other acquired or congenital immunodeficiency diseases, or a history of organ transplantation;
• Concomitant diseases that, in the judgment of the investigator, seriously endanger the patient's safety or interfere with the patient's completion of the study.