Moreover, densitometric analysis revealed that the expression of humanin was strongly positively correlated with the age of patients with pheochromocytoma (p = 6 × 10−4, R = 0.43), while for ACC and adrenocortical adenoma, we did not indicate any significant correlations. Here, MT-RNR2 is linked to hereditary pheochromocytoma-paraganglioma.