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Spectrum of metastatic and nonmetastatic skeletal findings with dual-phase 18F-FECH PET/CT in patients with biochemical relapse of prostate cancer

Haroon, Athar; Syed, Rizwan; Endozo, Raymond; Allie, Rayjanah; Freeman, Alex; Emberton, Mark; Bomanji, Jamshed

Nuclear Medicine Communications: May 2017 - Volume 38 - Issue 5 - p 407–414
doi: 10.1097/MNM.0000000000000665
ORIGINAL ARTICLES
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Introduction The aim of this study was to evaluate the spectrum of skeletal findings on dual-phase fluorine-18-fluoroethylcholine (18F-FECH) PET/CT performed during the work-up of patients referred for suspected prostate cancer relapse.

Materials and methods Three hundred 18F-FECH PET/CT scans were evaluated prospectively. The low-dose CT features of all cases were categorized as isodense, sclerotic, lytic or mixed lytic/sclerotic and maximum standardized uptake value (SUVmax) values were calculated. Findings on 18F-FECH PET/CT were correlated with Technetium-99m-methylene diphosphonate planar bone scans and serum prostate-specific antigen.

Results Patient age range was 50–90 years (median 71 years) and prostate-specific antigen values were in the range 0.04–372 ng/ml (Roche Modular method). Seventy-two lesions were detected on 18F-FECH PET/CT in 45 patients, including 31 (43%) in the pelvis, 17 (23%) in the spine (cervical 3, thoracic 8 and lumbar spine 6) and 10 (13%) in the ribs. Evaluation of low-dose CT in combination with PET helped to characterize benign findings in 21 (29%) lesions. The SUVmax for all except one benign lesion ranged from 0.49 to 2.15. In 51 (71%) lesions because of metastatic disease, SUVmax was 0.6–11.6 for those classified as sclerotic on low-dose CT, 0.7–8.58 for lytic lesions, 1.1–7.65 for isodense lesions and 1.27–3.53 for mixed lytic/sclerotic lesions. Of the 56 18F-FECH-avid lesions, 21 lesions showed avidity on bone scan [3 (23%) of the 13 isodense lesions, 14 (40%) of the 35 sclerotic lesions, 2 (50%) of the lytic lesions and 2 (50%) of the mixed sclerotic/lytic lesions].

Conclusion 18F-FECH PET/CT identified bone lesions in 15% of patients with suspected prostate cancer relapse. SUVmax in isolation cannot be used to characterize these lesions as benign or malignant. Minimal overlap of benign and malignant lesions was observed above SUVmax of 2.5. Low-dose CT of PET/CT is a useful tool to aid characterization.

aDepartment of Nuclear Medicine, Barts Health NHS Trust, St Bartholomew’s Hospital

bInstitute of Nuclear Medicine

cDepartment of Histopathology, University College London Hospitals NHS Trust

dDivision of Surgery and Interventional Science, University College London, London, UK

The abstract was presented at the British Nuclear Medicine Society Annual Meeting (21-24 April 2013 Brighton, UK).

Correspondence to Athar Haroon, MBBS, FRCR, Department of Nuclear Medicine, Barts Health NHS Trust, St Bartholomew’s Hospital, West Smithfield, London EC1A 7BE, UK Tel: +44 203 465 6408; fax: +44 203 594 3207; e-mail: atharharoon@yahoo.com

Received December 20, 2016

Received in revised form February 24, 2017

Accepted March 8, 2017

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