CXCR2 and neoplasm: Mice injected with SBC-2-CXCR1 or SBC2-CXCR2 cell lines showed a palpable tumour within 30 days after injection, whereas the mice injected with A375P-CXCR1, A375P-CXCR2 or A375P-control cell lines showed a tumour within a week.