While both strains are susceptible to lung tumor development, differences in sensitivity between these two strains has been linked to quantitative trait loci containing both tumor suppressor genes as well as inflammatory mediators, such as myeloperoxidase (Mpo), colony stimulating factor (Csf)3, CC chemokine receptor (Ccr10), and Ccl2 (Mcp-1) [54,55]. This evidence concerns the gene CCL2 and neoplasm.