RET and pheochromocytoma: RET, an oncogene responsible for multiple endocrine neoplasia (MEN) type 2A and 2B that develops into medullary thyroid carcinoma and pheochromocytoma, has been proven to induce STC1 expression, which is in line with immunohistochemistry results indicating that STC1 is highly expressed in specimens of MEN2B‐MTC.63