FPR1 and neoplasm: Importantly, the migration of FPR+ tumour cells induced by FCS or HS was partially and significantly inhibited by an FPR-specific antagonist cyclosporine H (CsH) (Wenzel-Seifert and Seifert, 1993; De Paulis et al, 1996), which had no effect on EGF-induced tumour cell migration (Figure 6B and C), suggesting the presence of FPR agonist(s) in FCS and HS.