Markers of leukocyte migration within or between different tissues and organs of the body were more highly expressed in the CHO-sensitive tumours than in the resistant (CCL2, CCL5, ICAM1, VCAM1, ITGAM, ITGB2) just as members of the Chemokine (C-X-C Motif) Ligand family inducing chemotaxis of T-cells (CXCL9, CXCL10) or B-cells (CXCL13) were up-regulated. The gene discussed is CCL5; the disease is neoplasm.