title: Prognostic value of 18F-fluorodeoxyglucose-positron emission tomography in patients with differentiated thyroid carcinoma and circulating antithyroglobulin autoantibodies.
abstract: OBJECTIVE
  To explore the prognostic value of F-fluorodeoxyglucose (FDG)-positron emission tomography (PET) in radioiodine-negative patients with differentiated follicular cell-derived thyroid carcinoma with circulating antithyroglobulin autoantibodies (TgAb).
  
  
  METHODS
  We retrospectively reviewed cases of all patients with differentiated thyroid cancer and increased TgAb referred for FDG-PET at Mayo Clinic, Rochester, Minnesota, from August 2001 to December 2004. PET findings were compared with results of other imaging and laboratory studies. Follow-up information was recorded until 19 December 2009.
  
  
  RESULTS
  Of the 17 patients identified, PET results were true positive in 10 and false negative in two. In eight of these 12 patients with confirmed residual or recurrent disease, the increased TgAb level persisted and the disease progressed. In four of the 12 patients, TgAb decreased or disappeared after further treatment. In five patients, no residual or recurrent disease was found during follow-up. PET results were true negative in these five patients; TgAb disappeared spontaneously in four of these patients.
  
  
  CONCLUSIONS
  Negative PET results were associated with the absence of active disease and disappearing TgAb over time. FDG-avid residual lesions were associated with more aggressive disease and persistently increased TgAb.
authors.affiliation: Department of Radiology, Mayo Clinic, Rochester, Minnesota 55905, USA.
authors.forename: Trond Velde
authors.initials: TV
authors.lastname: Bogsrud
authors.forename: Ian D
authors.initials: ID
authors.lastname: Hay
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Karantanis
authors.forename: Mark A
authors.initials: MA
authors.lastname: Nathan
authors.forename: Brian P
authors.initials: BP
authors.lastname: Mullan
authors.forename: Gregory A
authors.initials: GA
authors.lastname: Wiseman
authors.forename: Jan L
authors.initials: JL
authors.lastname: Kasperbauer
authors.forename: Carl C
authors.initials: CC
authors.lastname: Reading
authors.forename: Trine
authors.initials: T
authors.lastname: Björo
authors.forename: Val J
authors.initials: VJ
authors.lastname: Lowe
mesh_terms: D018263:Adenocarcinoma, Follicular; D000328:Adult; D000368:Aged; D001323:Autoantibodies / Q000276:immunology*; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D007457:Iodine Radioisotopes; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000000981:diagnostic imaging / Q000276:immunology; D049268:Positron-Emission Tomography / Q000379:methods*; D011379:Prognosis; D012189:Retrospective Studies; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging / Q000276:immunology; D014055:Tomography, Emission-Computed / Q000379:methods
chemical_list: D001323:Autoantibodies; D007457:Iodine Radioisotopes; C006606:anti-thyroglobulin; D019788:Fluorodeoxyglucose F18