AbstractPurpose:This trial investigated the safety and tolerability of camizestrant with cyclin-dependent kinase 4/6 inhibitors (CDK4/6i) in women with estrogen receptor–positive, HER2− advanced breast cancer.Patients and Methods:SERENA-1 (NCT03616587) is a phase I, multipart, open-label study in women with refractory estrogen receptor–positive, HER2− advanced breast cancer. Patients received oral once-daily camizestrant 75 or 150 mg plus abemaciclib; camizestrant 75, 150, or 300 mg plus palbociclib; or camizestrant 75 mg plus ribociclib 400 or 600 mg. Safety/tolerability, pharmacokinetics, efficacy, and impact on estrogen receptor 1 mutation ctDNA were assessed.Results:By September 16, 2024 (data cutoff), 53 patients had received camizestrant plus abemaciclib, 78 camizestrant plus palbociclib, and 60 camizestrant plus ribociclib. Patients had a median of 2 (range, 0–7) prior regimens for advanced disease; 83% had received a prior CDK4/6i and 59% prior fulvestrant. The most common treatment-emergent adverse events for camizestrant 75 mg (phase III dose) plus each CDK4/6i were diarrhea with abemaciclib (87.5%) and neutropenia with palbociclib (80%) and ribociclib (32.1% for 400 mg and 53.1% for 600 mg). The median camizestrant tmax was ∼4 hours postdose across combinations, with an estimated half-life of 9.5 to 17 hours. No clinically meaningful drug–drug interactions were evident. In this heavily pretreated population, CBR24 was 49.5% and the median progression-free survival was 7.4 months (95% confidence interval, 5.3–9.3), with antitumor activity across all combinations, including patients previously treated with CDK4/6i and/or fulvestrant, with or without estrogen receptor 1 mutation.Conclusions:Camizestrant is well tolerated, with antitumor activity in combination with CDK4/6i. These results support the evaluation of camizestrant 75 mg plus standard CDK4/6i doses in phase III trials.
Baird et al. (Wed,) studied this question.