An immunological mechanism of resistance to CDK4/6 inhibitors in HR+ breast cancer.

Abstract

CDK4/6 inhibitors are central to the clinical management of HR⁺HER2^- breast cancer. We have recently demonstrated that immunosuppressive, IL17-secreting γδ T cells recruited to the tumor microenvironment by a CCL2-dependent mechanism upon CDK4/6 inhibition can repolarize tumor-associated macrophages toward a CX3CR1⁺ phenotype associated with resistance to therapy.