Multigene Risk Score Combined With Ki-67 Dynamic Assessment in Stratified Neoadjuvant Endocrine Therapy Treatment With or Without CDK4/6 Inhibitors in HR+/HER2- Breast Cancer

Dalpiciclib, oral administration, 125g each time, once daily, days 1-21, with a 28-day cycle (3 weeks on/1 week off). Continuous medication for 6 cycles, or disease progression, intolerable toxicity, withdrawal from the study for any reason or death, whichever occurs first; or after researcher's judgement, patient would no longer benefit from the treatment.

2.5 mg, oral, once daily (continuously), with a 28-day cycle. Continuous medication for 6 cycles, or disease progression, intolerable toxicity, withdrawal from the study for any reason or death, whichever occurs first. Refer to drug instructions for specific usage