RNA expression levels of RET gene with other pheochromocytoma-related genes and UPR markers, Bip/GRP78, CHOP, ATF4, and ATF6, in her pheochromocytoma relative to her normal adrenal gland were analyzed by real time PCR (RT-PCR). This evidence concerns the gene RET and hereditary pheochromocytoma-paraganglioma.