Dr. Peng Yuan: In the Post-CDK4/6i Era, Entinostat Offers New Hope for Patients with HR+/HER2− Advanced Breast Cancer
Breast cancer remains one of the most prevalent malignancies among women worldwide, and its hormone receptor-positive, HER2-negative (HR+/HER2−) subtype accounts for nearly 70% of all cases. In recent years, the combination of CDK4/6 inhibitors (CDK4/6i) with endocrine therapy (ET) has become the gold standard for first-line treatment in metastatic settings. However, once progression occurs on CDK4/6i-based regimens, the optimal path forward is less clearly defined, presenting a persistent challenge in clinical decision-making.