PIK3CA and astrocytoma (excluding glioblastoma): We also identified 96 samples across seven different cancer types (breast n = 14, colorectal n = 24, endometrial n = 15, esophageal n = 4, gastric n = 34, prostate n = 3, and pediatric astrocytoma n = 2) harboring mutations in either PIK3CA or PTEN. These mutations might be expected to enrich for tumors responsive to the PI3 kinase inhibitors currently in development.