Association of high CD4-positive T cell infiltration with mutations in HLA class II-regulatory genes in microsatellite-unstable colorectal cancer - Surmann, Eva-Maria; Voigt, Anita Yvonne; Michel, Sara; Bauer, Kathrin; Reuschenbach, Miriam; Knebel Doeberitz, Magnus von; Kloor, Matthias (Cancer immunology immunotherapy, 2015)