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Mutation of the genes encoding the succinate dehydrogenase (SDH) subunits A, B, C, or D, or the SDHAF2 protein, cause the SDHx-hereditary paraganglioma syndromes. Hereditary susceptibility to metastatic sympathetic pheochromocytomas and paragangliomas is most commonly due to germline mutations in the SDHB gene. Individuals with SDHD mutations occasionally present with metastatic disease, while conversely...
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