Abstract
Multiple Endocrine Neoplasia type 2 (MEN2) was one of the first hereditary syndromes which they identified a genetic and molecular origin. It was possible due to the high phenotypic penetrance in families associated with the manifest clinically diagnosed diseases such as medullary thyroid cancer (MTC) and pheochromocytoma (PHEO).For families with MEN2 and MTC that present clinical heterog…