Hereditary Paraganglioma-Pheochromocytoma Syndromes, also known as hereditary pheochromocytoma-paraganglioma, is related to pheochromocytoma/paraganglioma syndrome 4 and pheochromocytoma/paraganglioma syndrome 1, and has symptoms including aphonia An important gene associated with Hereditary Paraganglioma-Pheochromocytoma Syndromes is MAX (MYC Associated Factor X), and among its related pathways/superpathways are Respiratory electron transport, ATP synthesis by chemiosmotic coupling, and heat production by uncoupling proteins. and Glucose / Energy Metabolism. The drugs Phenoxybenzamine and Vasodilator Agents have been mentioned in the context of this disorder. Affiliated tissues include adrenal gland and thyroid, and related phenotypes are paraganglioma and extraadrenal pheochromocytoma