Like FGFR3, FGF9 expression has also been identified in several tumor types, including breast, prostate, endometrioid and lung (Hendrix et al., 2006; Li et al., 2008; Marek et al., 2009; Ohgino et al., 2014), suggesting an important role in tumorigenesis. This evidence concerns the gene FGF9 and neoplasm.