The presence of both KIT and SCF has already been reported in several tumours (Hibi et al, 1991; Pietsch, 1993; Inoue et al, 1994; Hines et al, 1995; Kondoh et al, 1995; Lahm et al, 1995; Krystal et al, 1996; Ricotti et al, 1998; Zheng et al, 2004), suggesting either an autocrine or paracrine oncogenic effect. This evidence concerns the gene KITLG and neoplasm.