NCR1 and neoplasm: Although NKp46 has been shown to be involved in the killing of various tumor cell lines in vitro (Biassoni et al., 1999; Sivori et al., 1999, 2000a, 2000b; Weiss et al., 2004) and in vivo (Gazit et al., 2006; Halfteck et al., 2009), no cellular ligand has been identified so far for this receptor.