Although the specific targets of Ras/Raf/MEK/ERK pathway in the pathogenesis of pituitary adenomas are largely uncharacterized, our recent findings show that TR4, a potent regulator of corticotroph tumor growth and hormone secretion, is activated by ERK-mediated phosphorylation to regulate hormone synthesis [9]. Here, MAP2K7 is linked to pituitary gland adenoma.