Evaluation of androgen-induced effects on the uptake of [18F]FDG, [11C]choline and [11C]acetate in an androgen-sensitive and androgen-independent prostate cancer xenograft model

K.M. Emonds, J.V. Swinnen, E. Lerut, M. Koole, L. Mortelmans, F.M. Mottaghy

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Abstract

BACKGROUND: Androgen deprivation (AD) is generally used as a first-line palliative treatment in prostate cancer (PCa) patients with rising prostate-specific antigen (PSA) after primary therapy. To acquire an accurate detection of tumour viability following AD with positron emission tomography (PET), an androgen-independent uptake of tracers would be advantageous. Several metabolic PET tracers are employed for detecting recurrent PCa. We evaluated the effect of AD on the uptake of 2-deoxy-2-[18F]fluoro-d-glucose ([18F]FDG), [11C]choline and [11C]acetate in vivo. METHODS: An [18F]FDG, [11C]choline and [11C]acetate baseline micro(mu)PET/mu computed tomography (CT) scan was subsequently performed in xenografts of androgen-sensitive (LAPC-4) and androgen-independent (22Rv1) tumours in nude mice. An untreated control group was compared to a surgical castration group, i.e. androgen-deprived group. muPET/muCT imaging with the above-mentioned tracers was repeated 5 days after the start of treatment. The percentage change of SUVmax and SUVmeanTH in the tumours was calculated. RESULTS: AD did not significantly affect the uptake of [18F]FDG and [11C]choline in LAPC-4 tumours as compared with the uptake of both tracers in untreated tumours. In control 22Rv1 tumours, [11C]choline and [18F]FDG uptake increased over time. However, compared with the uptake in control tumours, AD significantly decreased the uptake of [11C]choline and tended to decrease [18F]FDG uptake. [11C]acetate uptake remained unaffected by AD in both PCa xenograft models. CONCLUSIONS: [18F]FDG and especially [11C]choline PET, which is currently used for the detection of recurrent PCa, could miss or underestimate the presence of local recurrent PCa following AD therapy. [11C]acetate uptake occurs independently of androgens and thus may be more favourable for detecting tumour viability during or following AD.
Original languageEnglish
Article number31
Pages (from-to)31
Number of pages10
JournalEuropean Journal of Nuclear Medicine and Molecular Imaging
Volume3
Issue number1
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • Prostate cancer
  • Androgen deprivation
  • PET
  • [F-18]FDG
  • [C-11]choline
  • [C-11]acetate
  • POSITRON-EMISSION-TOMOGRAPHY
  • LIPOGENIC GENE-EXPRESSION
  • FDG PET
  • C-11-ACETATE
  • DIAGNOSIS
  • C-11-CHOLINE
  • ACTIVATION
  • F-18-FDG
  • RECEPTOR
  • GLUCOSE

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