José Pablo Leone

Paxalisib with Trastuzumab for HER2-Positive Metastatic Breast Cancer with Active Brain Metastases: A Phase II Trial with Integrated Plasma and CSF ctDNA Analyses

Abstract Purpose: HER2+ breast cancer brain metastases (BCBM) frequently harbor PI3K/AKT/mTOR alterations. Preclinical HER2+ BCBM models demonstrated durable tumor regression with dual PI3K and mTOR inhibition. Our phase II trial evaluated paxalisib, a brain-penetrant dual PI3K/m...