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). doi:10.52163/yhc.v67iCD12.6144