Additionally, Evans et al. [67] linked decreased expression of FGF1, FGF2, FGFR2, and FGFR3 in cortical areas to depressive disorder, while Liu et al. [68] and Wang et al. [69] linked FGF2 and FGFR2, respectively, to bipolar disorder. This evidence concerns the gene FGF1 and depressive disorder.