Homozygous PMS2 deletion causes a severe colorectal cancer and multiple adenoma phenotype without extraintestinal cancer. - Will, O; Carvajal-Carmona, L; Gorman, P; Howarth, K; Jones, A; Polanco-Echeverry, G; Chinaleong, J; Günther, T; Silver, A; Clark, S; Tomlinson, I (Gastroenterology, 2007)