Evaluation of variation in the phosphoinositide-3-kinase catalytic subunit alpha oncogene and breast cancer risk. by Stevens, K, Garcia-Closas, M, Fredericksen, Z, Kosel, M, Pankratz, V, Hopper, J, Dite, G, Apicella, C, Southey, M, Schmidt, M, Broeks, A, Van 't Veer, L, Tollenaar, R, Fasching, P, Beckmann, M, Hein, A, Ekici, AB, Johnson, N, Peto, J, dos Santos Silva, I, Gibson, L, Sawyer, E, Tomlinson, I, Kerin, M, Chanock, S