Atirmociclib and fulvestrant for patients with HR+/HER2- advanced/metastatic breast cancer who progressed on a prior cyclin-dependent kinase 4/6 inhibitor: primary analysis of the randomized FourLight-1 trial.
BACKGROUND Atirmociclib is a potential first-in-class, highly selective cyclin-dependent kinase (CDK) 4 inhibitor, demonstrating significantly greater selectivity over CDK6. In a phase 1/2a study, atirmociclib plus endocrine therapy was well tolerated and showed encouraging antitumor activity in patients with HR+/HER2-...