Multiple phase 3 breast cancer trials reported significant findings in early 2026, including positive results for novel therapies across different subtypes. Key data includes progression-free survival benefits for palbociclib in HR-positive, HER2-positive advanced breast cancer and investigations of antibody-drug conjugates and combination therapies. Full trial findings are expected to be presented at upcoming medical meetings.
Recent developments in breast cancer treatment include new clinical trials for advanced disease, findings on CDK4/6 inhibitor sequencing, and discovery of genetic markers explaining drug resistance in HER2-positive breast cancer.
Bristol Myers Squibb and SystImmune reported that antibody-drug conjugate izalontamab brengitecan achieved statistically significant improvements in both progression-free and overall survival versus chemotherapy in a Phase III trial for triple-negative breast cancer.
Izalontamab brengitecan demonstrated statistically significant improvements in progression-free survival and overall survival compared to chemotherapy in patients with previously treated metastatic triple-negative breast cancer, marking the third Phase III success for the bispecific ADC.
