1 23 Tumor Biology Tumor Markers, Tumor Targeting and Translational Cancer Research ISSN 1010-4283 Tumor Biol. DOI 10.1007/s13277-014-2641-2 Association of DCC, MLH1, GSTT1, GSTM1, and TP53 gene polymorphisms with colorectal cancer in Kazakhstan Leyla Djansugurova, Gulnur Zhunussova, Elmira Khussainova, Olzhas Iksan, Georgiy Afonin, Dilyara Kaidarova & M. Iqbal Parker