Mapping of Succinate Dehydrogenase Losses in 2258 Epithelial Neoplasms

Losses in the succinate dehydrogenase (SDH) complex characterize 20% to 30% of extra-adrenal paragangliomas and 7% to 8% of gastric GISTs, and rare renal cell carcinomas. This loss is reflected as lack of the normally ubiquitous immunohistochemical expression of the SDH subunit B (SDHB). In paragangliomas, SDHB loss correlates with homozygous loss of any of the SDH subunits, typically by loss-of-function mutations. The occurrence of SDHB losses...