LMO2-associated clonal T cell proliferation in two patients after gene therapy for SCID-X1. by Hacein-Bey-Abina, S, Von Kalle, C, Schmidt, M, McCormack, M, Wulffraat, N, Leboulch, P, Lim, A, Osborne, C, Pawliuk, R, Morillon, E, Sorensen, R, Forster, A, Fraser, P, Cohen, J, de Saint Basile, G, Alexander, I, Wintergerst, U, Frebourg, T, Aurias, A, Stoppa-Lyonnet, D, Romana, S, Radford-Weiss, I, Gross, F, Valensi, F, Delabesse, E