DOI: 10.1007/s00259-018-3983-6Pages: 1-7

Amyloid load but not regional glucose metabolism predicts conversion to Alzheimer’s dementia in a memory clinic population

1. University of Freiburg, Department of Nuclear Medicine, Medical Center - University of Freiburg, Faculty of Medicine

2. University of Freiburg, Center for Geriatrics and Gerontology Freiburg, Medical Center - University of Freiburg, Faculty of Medicine

3. University of Freiburg, Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Faculty of Medicine

4. University of Freiburg, Department of Neurology, Medical Center - University of Freiburg, Faculty of Medicine

5. University Hospital Hamburg Eppendorf, Department of Nuclear Medicine

Correspondence to:
Lars Frings
Tel: +49 761 270 38861
Email: lars.frings@uniklinik-freiburg.de

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Abstract

Purpose

The value of imaging regional glucose metabolism with [18F]FDG PET for the prediction of progression from mild cognitive impairment (MCI) to Alzheimer’s dementia (AD) is controversial. The predictive value of imaging with [18F]FDG PET was therefore tested and compared with that of imaging beta-amyloid load with [11C]PIB PET in the same memory clinic population of MCI patients.

Methods

Thirty-nine patients with MCI who had undergone [18F]FDG as well as [11C]PIB PET were identified from a single-centre clinical registry. [18F]FDG and [11C]PIB PET images were rated as positive or negative for the presence of regional hypometabolism typical of AD and beta-amyloid deposition, respectively. Raters were blinded to the clinical information. Patients were followed clinically for 2.7 ± 1.2 years after PET. Cox proportional hazards models, adjusted for age and sex, were used to test the predictive value of [18F]FDG PET, [11C]PIB PET, and both in combination.

Results

[18F]FDG PET did not significantly predict conversion to AD (p > 0.1). By contrast, models including [11C]PIB PET only (p < 0.05) or both [18F]FDG and [11C]PIB PET (p < 0.05) significantly predicted conversion to AD. The hazard ratio for AD in patients with a positive [11C]PIB scan was 10.2 (95% confidence interval 1.3–78.1). The results were confirmed by analysis of semiquantitative measures using normalized [18F]FDG uptake and [11C]PIB standardized uptake value ratios in AD-typical regions as continuous predictors.

Conclusion

In contrast to [11C]PIB PET, [18F]FDG PET did not predict conversion from MCI to AD in this clinical patient sample. Therefore, amyloid PET should be preferred for individual prediction and patient counselling in clinical practice.

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  • Accepted: Feb 18, 2018
  • Online: Mar 15, 2018

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