Androgen deprivation therapy influences the uptake of 11C-choline in patients with recurrent prostate cancer: the preliminary results of a sequential PET/CT study
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The influence of androgen deprivation therapy (ADT) on 11C-choline uptake in patients with prostate cancer (PC) has not yet been clarified. The aim of our study was to investigate this issue by means of sequential 11C-choline positron emission tomography (PET)/CT in patients with recurrent PC.
We retrospectively studied 14 recurrent PC patients (mean age 67 years, range 55–82) during follow-up after radical prostatectomy (RP) with rising serum prostate-specific antigen (PSA) levels. All patients had undergone at least two consecutive 11C-choline PET/CT scans: the first 11C-choline PET/CT before commencing ADT and the second 11C-choline PET/CT after 6 months of ADT administration.
The mean serum PSA level before ADT was 17.0 ± 44.1 ng/ml. After 6 months of ADT administration the PSA value significantly decreased in comparison to baseline (PSA = 2.4 ± 3.1 ng/ml, p < .025). Moreover, before starting ADT, 13 of 14 patients had positive 11C-choline PET/CT for metastatic spread, while after 6 months of ADT administration in 9 of 14 patients 11C-choline PET/CT became negative.
These preliminary results suggest that ADT significantly reduces 11C-choline uptake in androgen-sensitive PC patients.
KeywordsSequential choline PET/CT Prostate cancer Recurrent disease Androgen deprivation therapy
Conflicts of interest
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