c-Met-β1 (Hui et al., 2009; Bogorad et al., 2014; Singh et al., 2019), c-Met-α3 (Tesfay et al., 2016), and c-Met-α6β4 (Trusolino et al., 2001) association was shown to occur in a range of tumour cells in the absence of HGF. This evidence concerns the gene HGF and neoplasm.