Efficacy and Safety of Dalpiciclib With Endocrine Therapy as Adjuvant Treatment in HR+/ HER2- Early Breast Cancer

Inclusion Criteria: * Patient is ≥ 18 years-old * Patient is female with known menopausal status (postmenopausal or premenopausal/perimenopause) * Patient with histologically confirmed HR+/HER2- early breast cancer (immunohistochemical ER and/or PR≥10%) * Histologically confirmed invasive breast cancer with anatomic stages of IIA-IIIC stage (T2-4N0-3M0), of which stage IIA only included T1N1M0 * Patients with or without neoadjuvant or adjuvant chemotherapy/ radiotherapy were eligible for inclusion * From operation to enrollment should not exceed 12 months * Patient has an Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1 Exclusion Criteria: * metastatic disease (Stage IV) or inflammatory breast cancer * Previous or current history of malignant neoplasms, except for curatively treated:Basal and squamous cell carcinoma of the skin,Carcinoma in situ of the cervix. * Clinically relevant cardiovascular disease:Known history of uncontrolled or symptomatic angina, clinically significant arrhythmias, congestive heart failure, transmural myocardial infarction, uncontrolled hypertension ≥180/110); * A history of allergy to the drugs in this study； * Unable or unwilling to swallow tablets * History of gastrointestinal disease with diarrhea as the major symptom.