title: Familiar Papillary Thyroid Carcinoma in a Large Brazilian Family Is Not Associated with Succinate Dehydrogenase Defects.
abstract: BACKGROUND
  Thyroid cancer is the most common endocrine gland malignancy. Advances in understanding the genetic basis for thyroid cancer revealed the potential involvement of several genes in the formation of thyroid tumors. Mutations in the gene coding for succinate dehydrogenase subtype B (SDHB) have been implicated in papillary thyroid cancer (PTC). Succinate dehydrogenase (SDH) is a heterotetrameric protein composed of four subunits, SDHA, SDHB, SDHC, and SDHD, and participates in both the electron transport chain and the tricarboxylic acid cycle. The aim of the study was to evaluate the association between variants in the SDHA, SDHB, SDHC, and SDHD genes and familiar PTC in a large Brazilian family.
  
  
  METHODS
  Four patients with PTC, 1 patient with PTC and gastrointestinal stromal tumor (GIST), 1 patient with GIST, and their relatives - several of them with different thyroid problems - from a large Brazilian family were screened for genetic variations of SDHx genes with the use of polymerase chain reaction-single-stranded conformational polymorphism and direct sequencing.
  
  
  RESULTS
  Only one rare variation in SDHA was found in some of the family members, but not segregating with the disease. No other genetic variants of these genes were detected in the family members that presented with PTC and/or GIST.
  
  
  CONCLUSIONS
  Familiar PTC and a GIST were not associated with SDHx mutations; additional genetic defects, yet unknown, may be responsible for the development of tumor.
authors: Group for Advanced Molecular Investigation (NIMA), Graduate Program in Health Sciences (PPGCS), School of Medicine (EM), Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Brazil.
authors: Elen Dias
authors: ED
authors: Accordi
authors: Section on Endocrinology and Genetics, Program on Developmental Endocrinology and Genetics (PDEGEN) and Pediatric Endocrinology Inter-Institute Training Program, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Md., USA.
authors: Paraskevi
authors: P
authors: Xekouki
authors: Group for Advanced Molecular Investigation (NIMA), Graduate Program in Health Sciences (PPGCS), School of Medicine (EM), Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Brazil.
authors: Bruna
authors: B
authors: Azevedo
authors: Group for Advanced Molecular Investigation (NIMA), Graduate Program in Health Sciences (PPGCS), School of Medicine (EM), Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Brazil.
authors: Rodrigo Bertollo
authors: RB
authors: de Alexandre
authors: Group for Advanced Molecular Investigation (NIMA), Graduate Program in Health Sciences (PPGCS), School of Medicine (EM), Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Brazil; Álvaro Center for Analysis and Clinical Research - Diagnósticos da América (DASA), Cascavel, Brazil.
authors: Carla
authors: C
authors: Frasson
authors: Group for Advanced Molecular Investigation (NIMA), Graduate Program in Health Sciences (PPGCS), School of Medicine (EM), Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Brazil.
authors: Siliane Marie
authors: SM
authors: Gantzel
authors: Department of Radiology and Imaging Sciences, Clinical Center, National Institutes of Health (NIH), Bethesda, Md., USA.
authors: Georgios Z
authors: GZ
authors: Papadakis
authors: Section on Endocrinology and Genetics, Program on Developmental Endocrinology and Genetics (PDEGEN) and Pediatric Endocrinology Inter-Institute Training Program, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Md., USA.
authors: Anna
authors: A
authors: Angelousi
authors: Section on Endocrinology and Genetics, Program on Developmental Endocrinology and Genetics (PDEGEN) and Pediatric Endocrinology Inter-Institute Training Program, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Md., USA.
authors: Constantine A
authors: CA
authors: Stratakis
authors: Group for Advanced Molecular Investigation (NIMA), Graduate Program in Health Sciences (PPGCS), School of Medicine (EM), Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Brazil.
authors: Vanessa Santos
authors: VS
authors: Sotomaior
authors: Group for Advanced Molecular Investigation (NIMA), Graduate Program in Health Sciences (PPGCS), School of Medicine (EM), Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Brazil; Section on Endocrinology and Genetics, Program on Developmental Endocrinology and Genetics (PDEGEN) and Pediatric Endocrinology Inter-Institute Training Program, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Md., USA.
authors: Fabio R
authors: FR
authors: Faucz
keywords: Endocrine tumors; Genetics; Mutations; Papillary thyroid cancer; Succinate dehydrogenase