The Use of Abemaciclib in Combination with Aromatase Iinhibitors in Metastatic HR+ HER2/Neu-Negative Breast Cancer

The article presents a clinical case illustrating the effectiveness of abemaciclib in combination with anastrozole in metastatic estrogen receptor-positive HER2/neu-negative breast cancer (BC). CDK4/6 inhibitors have changed the paradigm of treatment of patients with hormone-positive HER2 metastatic BC. Thanks to the ability of palbociclib, ribociclib and abemaciclib to delay and overcome resistance to endocrine therapy, the effectiveness of treatment of patients not only with newly diagnosed disease, but also with endocrine – resistant, and taking into account the independent effectiveness of abemaciclib and chemorefractor BC has increased. The combination of aromatase inhibitors and abemaciclib is associated with an increase in the effectiveness of treatment in the most prognostically unfavorable contingent of patients.