CCR1 and CCR5 are detectable in most human tumors and are usually associated with leukocyte trafficking.47 Genetic data, however, indicated a modest chemotactic effect of CCR1 and CCR5 in myeloid cell trafficking and showed the dominant role of CCR2 in this process.12 Our adoptive cell transfer experiment confirmed these findings and argued against a prominent role of CCR1 and CCR5 in myeloid cell trafficking to the tumor. This evidence concerns the gene CCR5 and neoplasm.