PI3Kα activates integrin α4β1 to establish a metastatic niche in lymph nodes. - Garmy-Susini B; Avraamides CJ; Desgrosellier JS; Schmid MC; Foubert P; Ellies LG; Lowy AM; Blair SL; Vandenberg SR; Datnow B; Wang HY; Cheresh DA; et al. (Proceedings of the National Academy of Sciences of the United States of America, 2013)