FPR1 and neoplasm: On the other hand, we have already documented that: (i) uPAR is highly expressed in human CHS tissues [31]; (ii) CHS tumor cells expressing uPAR and the formyl-peptide receptor type 1 (FPR1) acquire the ability to migrate and invade basal membranes [19]; (iii) uPAR triggers cell migration through the interaction of its 84–95 sequence with the FPR1 [35].