Our results indicated that DiI-labeled N1 neutrophils preferentially accumulated at MNs that were abundant with CXCL1, CXCL2, and CXCL5 in vivo, including the lungs in tumor-free mice and mice bearing non-metastatic 67NR or 4T07 tumor and the scaffolds in all the mice regardless of their healthy or diseased conditions (Fig. 6i). Here, CXCL1 is linked to neoplasm.