Clinical impact of PSMA-based 18F–DCFBC PET/CT imaging in patients with biochemically recurrent prostate cancer after primary local therapy
- 1.1k Downloads
The purpose of our study was to assess 18F–DCFBC PET/CT, a PSMA targeted PET agent, for lesion detection and clinical management of biochemical relapse in prostate cancer patients after primary treatment.
This is a prospective IRB-approved study of 68 patients with documented biochemical recurrence after primary local therapy consisting of radical prostatectomy (n = 50), post radiation therapy (n = 9) or both (n = 9), with negative conventional imaging. All 68 patients underwent whole-body 18F–DCFBC PET/CT, and 62 also underwent mpMRI within one month. Lesion detection with 18F–DCFBC was correlated with mpMRI findings and pre-scan PSA levels. The impact of 18F–DCFBC PET/CT on clinical management and treatment decisions was established after 6 months’ patient clinical follow-up.
Forty-one patients (60.3%) showed at least one positive 18F–DCFBC lesion, for a total of 79 lesions, 30 in the prostate bed, 39 in lymph nodes, and ten in distant sites. Tumor recurrence was confirmed by either biopsy (13/41 pts), serial CT/MRI (8/41) or clinical follow-up (15/41); there was no confirmation in five patients, who continue to be observed. The 18F–DCFBC and mpMRI findings were concordant in 39 lesions (49.4%), and discordant in 40 lesions (50.6%); the majority (n = 32/40) of the latter occurring because the recurrence was located outside the mpMRI field of view. 18F–DCFBC PET positivity rates correlated with PSA values and 15%, 46%, 83%, and 77% were seen in patients with PSA values <0.5, 0.5 to <1.0, 1.0 to <2.0, and ≥2.0 ng/mL, respectively. The optimal cut-off PSA value to predict a positive 18F–DCFBC scan was 0.78 ng/mL (AUC = 0.764). A change in clinical management occurred in 51.2% (21/41) of patients with a positive 18F–DCFBC result, generally characterized by starting a new treatment in 19 patients or changing the treatment plan in two patients.
18F–DCFBC detects recurrences in 60.3% of a population of patients with biochemical recurrence, but results are dependent on PSA levels. Above a threshold PSA value of 0.78 ng/mL, 18F–DCFBC was able to identify recurrence with high reliability. Positive 18F–DCFBC PET imaging led clinicians to change treatment strategy in 51.2% of patients.
Keywords18F-DCFBC PSMA Prostate cancer Biochemical recurrence PSMA-based PET imaging
This project has been funded in whole or in part with federal funds from the National Cancer Institute, National Institutes of Health, under Contract No. HHSN261200800001E. The content of this publication does not necessarily reflect the views or policies of the Department of Health and Human Services, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.
Compliance with ethical standards
Conflict of interest
Authors have no conflict of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all individual participants included in the study.
- 8.Novo JF, Lopez SP, Aguilo FL, Miranda EF. Diagnostic methodology for the biochemical recurrence of prostate cancer after brachytherapy. Arch Esp Urol. 2006;59(10):1063–7.Google Scholar
- 12.Rowe SP, Macura KJ, Ciarallo A, Mena E, Blackford A, Nadal R, et al. Comparison of prostate-specific membrane antigen-based 18F-DCFBC PET/CT to conventional imaging modalities for detection of hormone-naive and castration-resistant metastatic prostate cancer. Journal of nuclear medicine : official publication, Society of Nuclear Medicine. 2016;57(1):46–53.CrossRefGoogle Scholar
- 13.Cho SY, Gage KL, Mease RC, Senthamizhchelvan S, Holt DP, Jeffrey-Kwanisai A, et al. Biodistribution, tumor detection, and radiation dosimetry of 18F-DCFBC, a low-molecular-weight inhibitor of prostate-specific membrane antigen, in patients with metastatic prostate cancer. Journal of nuclear medicine : official publication, Society of Nuclear Medicine. 2012;53(12):1883–91.CrossRefGoogle Scholar
- 14.Surti S, Kuhn A, Werner ME, Perkins AE, Kolthammer J, Karp JS. Performance of Philips Gemini TF PET/CT scanner with special consideration for its time-of-flight imaging capabilities. J Nuclear Med Off Publ Soc Nuclear Med. 2007;48(3):471–80.Google Scholar
- 21.Eiber M, Maurer T, Souvatzoglou M, Beer AJ, Ruffani A, Haller B, et al. Evaluation of hybrid (6)(8)Ga-PSMA ligand PET/CT in 248 patients with biochemical recurrence after radical prostatectomy. J Nuclear Med Off Publ Soc Nuclear Med. 2015;56(5):668–74.Google Scholar
- 23.Einspieler I, Rauscher I, Duwel C, Kronke M, Rischpler C, Habl G, et al. Detection efficacy of hybrid 68Ga-PSMA ligand PET/CT in prostate cancer patients with biochemical recurrence after primary radiation therapy defined by Phoenix criteria. Journal of nuclear medicine : official publication, Society of Nuclear Medicine. 2017.Google Scholar
- 26.Albisinni S, Artigas C, Aoun F, Biaou I, Grosman J, Gil T, et al. Clinical impact of 68 Ga-prostate-specific membrane antigen (PSMA) positron emission tomography/computed tomography (PET/CT) in patients with prostate cancer with rising prostate-specific antigen after treatment with curative intent: preliminary analysis of a multidisciplinary approach. BJU Int. 2016.Google Scholar