A phase Ib study of pictilisib (GDC-0941) in combination with paclitaxel, with and without bevacizumab or trastuzumab, and with letrozole in advanced breast cancer oleh Patrick Schöffski, Sara Cresta, Ingrid A. Mayer, Hans Wildiers, Silvia Damian, Steven Gendreau, Isabelle Rooney, Kari M. Morrissey, Jill M. Spoerke, Vivian W. Ng, Stina M. Singel, Eric Winer