Indeed in GH-secreting pituitary tumors from patients with acromegaly (n = 10), we confirmed a significant decrease in PRKAR2B expression (Fig. 6a) and a significant increase in HIF-1a expression compared with normal anterior pituitary glands (Fig. 6c, a) and this was also shown at protein level (Fig. 6d, b). Here, HIF1A is linked to pituitary tumor.