HR-Positive Breast Cancer
Dr. Sammons on RLY-2608 plus fulvestrant in HR+/HER2– mBC with PIK3CA mutations: safety, efficacy, and trial updates. INAVO120 shows OS benefit with inavolisib in PIK3CA-mutated HR+/HER2– aBC, raising new considerations for first-line care. Vepdegestrant improves PFS in ESR1-mutant ER+/HER2- breast cancer, offering a well-tolerated oral option post-CDK4/6. Elinzanetant reduces vasomotor symptoms from endocrine therapy in HR+ breast cancer, with rapid onset and good tolerability. AI-powered TIL analysis may predict pCR and survival outcomes in HR+/HER2– breast cancer treated with neoadjuvant chemo. About 1 in 10 patients with high RS early HR+/HER2- BC decline chemo, which is tied to worse overall survival, per ASCO data. Imlunestrant improved quality of life and physical function in patients with ER+/HER2– breast cancer in the EMBER-3 trial. Inavolisib + palbociclib + fulvestrant extends OS and delays chemo in PIK3CA-mutant HR+/HER2- advanced breast cancer. Imlunestrant plus abemaciclib improved PFS across subgroups in ER+/HER2- breast cancer, per EMBER-3 data. About 40% of patients on AI + palbociclib developed ESR1 mutations in PADA-1, emerging as early as 6 months into treatment. Dual immunotherapy plus trastuzumab shows activity in ER+ or PD-L1+ trastuzumab-resistant HER2+ breast cancer. T-DXd improved PFS and response rates vs chemo in HR+/HER2-low or -ultralow metastatic breast cancer in DESTINY-Breast06. PALMIRA trial shows limited benefit of palbociclib rechallenge in HR+/HER2- breast cancer, guiding future treatment choices. Real-world data reveal varying efficacy of CDK4/6 inhibitors in HR+/HER2- aBC, supporting personalized treatment choices. Palbociclib rechallenge did not significantly improve PFS in HR+/HER2- advanced breast cancer, PALMIRA trial finds. iDFS strongly correlates with OS in HR+/HER2- early breast cancer, supporting its use as a surrogate endpoint in trials. Imlunestrant with or without abemaciclib improved PFS in ER+/HER2- advanced breast cancer post-endocrine therapy.
Final results from the PENELOPE-B trial show palbociclib did not improve survival in high-risk HR+/HER2– breast cancer. Camizestrant plus CDK4/6 inhibition significantly improved PFS in HR+/HER2– advanced breast cancer with ESR1 mutations. Dr. Mik Rinne discusses a study on the efficacy of the CDK2 inhibitor BLU-222 in patients with HR+/HER2- breast cancer.