Erratum for the Research Article: “PI3K inhibition results in enhanced estrogen receptor function and dependence in hormone receptor–positive breast cancer” by A. Bosch, Z. Li, A. Bergamaschi, H. Ellis, E. Toska, A. Prat, J. J. Tao, D. E. Spratt, N. T. Viola-Villegas, P. Castel, G. Minuesa, N. Morse, J. Rodón, Y. Ibrahim, J. Cortes, J. Perez-Garcia, P. Galvan, J. Grueso, M. Guzman, J. A. Katzenellenbogen, M. Kharas, J. S. Lewis, M. Dickler, V. Serra, N. Rosen, S. Chandarlapaty, M. Scaltriti, J. Baselga