18F-FDG PET, genotype-corrected ACE and sIL-2R in newly diagnosed sarcoidosis

  • Ruth G. Keijsers
  • Fred J. Verzijlbergen
  • Wim J. Oyen
  • Jules M. van den Bosch
  • Henk J. Ruven
  • Heleen van Velzen-Blad
  • Jan C. Grutters
Original Article

Abstract

Purpose

Angiotensin-converting enzyme (ACE) and soluble interleukin-2 receptor (sIL-2R) are serological markers, widely used for determining sarcoidosis activity. 18F-FDG PET has proven to be a sensitive technique in the imaging of sarcoidosis. The aim of this study was to determine sensitivity of 18F-FDG PET, genotype-corrected ACE and sIL-2R in active sarcoidosis as well as their correlation.

Methods

This retrospective study included 36 newly diagnosed, symptomatic sarcoidosis patients. ACE and sIL-2R levels were simultaneously obtained within 4 weeks of 18F-FDG PET. ACE was corrected for genotype and expressed as Z-score. 18F-FDG PET was visually evaluated and scored as positive or negative. Maximum and average standardized uptake values (SUVmax and SUVavg) were compared with ACE and sIL-2R.

Results

18F-FDG PET was found positive in 34 of 36 patients (94%). Thirteen patients (36%) showed an increased ACE with the highest sensitivity found in patients with the I/I genotype (67%). Seventeen patients (47%) showed an increased sIL-2R. No correlation was found between SUV and ACE or sIL-2R. Increased ACE and sIL-2R correlated with a positive 18F-FDG PET in 12 patients (92%) and 16 patients (94%), respectively.

Conclusion

18F-FDG PET is a very sensitive technique to assess active sarcoidosis, in contrast with ACE and sIL-2R, suggesting a pivotal role for 18F-FDG PET in future sarcoidosis assessment.

Keywords

18F-FDG PET Angiotensin-converting enzyme Soluble interleukin-2 receptor Sarcoidosis 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Ruth G. Keijsers
    • 1
  • Fred J. Verzijlbergen
    • 1
  • Wim J. Oyen
    • 2
  • Jules M. van den Bosch
    • 3
  • Henk J. Ruven
    • 4
  • Heleen van Velzen-Blad
    • 5
  • Jan C. Grutters
    • 3
  1. 1.Department of Nuclear MedicineSt. Antonius Hospital NieuwegeinNieuwegeinThe Netherlands
  2. 2.Department of Nuclear MedicineRadboud University Nijmegen Medical CenterNijmegenThe Netherlands
  3. 3.Department of PulmonologySt. Antonius Hospital NieuwegeinNieuwegeinThe Netherlands
  4. 4.Department of Clinical ChemistrySt. Antonius Hospital NieuwegeinNieuwegeinThe Netherlands
  5. 5.Department of Medical Microbiology and ImmunologySt. Antonius Hospital NieuwegeinNieuwegeinThe Netherlands

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