FPR1 and osteosarcoma: In this study, we found that osteosarcoma and chondrosarcoma cells express comparable levels of FPR1 on cell surface and that the peptide [SRSRY] that displays a long-time resistance to enzymatic digestion in serum [25], inhibits, at 10 nM concentration, both migration and invasion of osteosarcoma and chondrosarcoma cell lines exposed to growth medium.