Overall survival results from SOLAR-1, a phase III study of alpelisib + fulvestrant for hormone receptor-positive, human epidermal growth factor receptor 2-negative advanced breast cancer
Phosphatidylinositol 3-kinase (PI3K) pathway hyperactivation due to PIK3CA mutations contributes to poor survival in patients (pts) with HR+, HER2– ABC (Mosele 2020). In the phase III SOLAR-1 trial of pts with progression on/after aromatase inhibitor (AI), the PI3Kα inhibitor ALP together with FUL significantly improved progression-free survival (PFS) in the PIK3CA-mutant (mut) cohort (HR 0.65; 95% CI 0.50-0.85; P<0.001; median [m] PFS 11.0 mo with ALP + FUL vs 5.7 mo with placebo [PBO] + FUL), a population with poor prognosis. At final PFS analysis, the first interim OS results were immature.
Hope S. Rugo