Compare Continuation of Original Targeted Therapy With Trastuzumab Combined With Pyrotinib and Capecitabine as Postoperative Adjuvant Therapy in Non-pCR Patients With HER2 Positive Early Breast Cancer

Patients in the experimental arm will receive trastuzumab + pyrotinib + capecitabine

Trastuzumab: Initial loading dose of 8 mg/kg followed by 6 mg/kg every 3 weeks. One year of trastuzumab treatment (including: neoadjuvant phase and adjuvant phase) Pertuzumab: 840 mg loading dose followed by 420 mg fixed dose