Germline epigenetic silencing of the tumor suppressor gene PTPRJ in early-onset familial colorectal cancer. by Venkatachalam, R, Ligtenberg, M, Hoogerbrugge, N, Schackert, H, Görgens, H, Hahn, M, Kamping, E, Vreede, L, Hoenselaar, E, van der Looij, E, Goossens, M, Churchman, M, Carvajal-Carmona, L, Tomlinson, I, Bruijn, d, Van Kessel, A, Kuiper, R