POMC and Adrenal insufficiency: Whether this subtle difference in the mean peak stimulated cortisol after PRRT reflects any partial radiation-induced adrenal insufficiency or just a less stressful state of patients remains unclear; nevertheless, such a difference is not clinically relevant as any of the patients failed the ACTH stimulation test, and thus none of them would be diagnosed with adrenal insufficiency nor require glucocorticoid replacement therapy [115].