SDHB and paraganglioma: In patients with Carney–Stratakis syndrome, in which the development of GISTs and paragangliomas is an inherited condition, and in Carney triad patients, in which the development of GISTs, paragangliomas, and pulmonary chondromas is not an inherited condition, GISTs lacking expression of SDHB protein develop in the stomach, most of which are multifocal.