Elevated expression of FABP4 and secretion of FABP4 by prostate cancer cells trigger the invasiveness of the prostate cancer by stimulation of matrix metalloproteinases (MMPs) via phosphatidylinositol 3-kinase (PI3K) and mitogen-activated protein kinase (MAPK) signalling pathways [172]. This evidence concerns the gene WNK2 and prostate cancer.