THE EFFICACY OF ENDOCRINE COMBINED WITH CDK4 6 INHIBITORS IN PATIENTS WITH HORMONE RECEPTOR - POSITIVE, HER2 - NEGATIVE RECURRENT OR METASTATIC BREAST CANCER. YHCĐ 2026, 67 (Số CĐ12- Bệnh viện Ung bướu Nghệ An). https://doi.org/10.52163/yhc.v67iCD12.6144.