PGF and pituitary tumor: Compared with normal pituitary tissue, genes with the highest to lowest expression levels in pituitary tumor tissue were VEGFC (19.3-fold, p<0.0001), PGF (13.4-fold, p<0.0001), VEGFA (4.2-fold, p<0.0001) and VEGFB (2.2-fold, p=0.002) (Figure 3A).