Natural killer cells are scarce in colorectal carcinoma tissue despite high levels of chemokines and cytokines - Halama, Niels; Kahlert, Christian; Rahbari, Nuh Nabi; Weitz, Jürgen; Kloor, Matthias; Zörnig, Inka; Schirmacher, Peter; Brand, Karsten; Grabe, Niels (Clinical cancer research, 2011)