CXCL2 and malignant colon neoplasm: Reference 34 to “Doll, D.; Keller, L.; Maak, M.; Boulesteix, A.L.; Siewert, J.R.; Holzmann, B.; Janssen, K.P. Differential expression of the chemokines GRO-2, GRO-3, and interleukin-8 in colon cancer and their impact on metastatic disease and survival.