This study aims to assess the diagnostic role of F-FDG PET/computed tomography in primary staging and restaging of testicular cancer in comparison with contrast-enhanced diagnostic thoracic-abdominopelvic computed tomography.

Thirty-two consecutive male patients with testicular carcinoma (median age: 29, min-max: 17-65) who were referred to the nuclear medicine department for F-FDG PET/computed tomography were retrospectively included in the study. Patients were evaluated based on the F-FDG PET/computed tomography indications and germ cell tumor subtypes.

On patient-based analysis, overall sensitivity, specificity, PPV, NPV and accuracy of 18F-FDG PET/computed tomography were 71%, 100%, 100%, 30% and 75%. On lesion-based analysis, for evaluation of lymph node metastasis they were 76%, 100%, 100%, 57% and 81%, and for detection of distant metastasis 85%, 100%, 100%, 90% and 93%, respectively. Median SUVmax for seminomas were calculated as 14.2 and for nonseminomas 7.8 (P = 0.62) Mean time to progression and overall survival were calculated as 76.6 ± 10.7 and 111 ± 7.5 months, respectively. Mean overall survival and time to progression for PET-positive and negative groups was not found significant (P = 0.69 and P = 0.81). The only significant factor in predict overall survival was the presence of distant organ metastases in PET/computed tomography (124.6 ± 5.2 vs. 78.7 ± 14.0 months, P = 0.02).

In this single-center experience with a limited number of patients, F-FDG PET/computed tomography appears to have a value of staging and restaging for both seminomatous and non-seminomatous GCTs.

Nuclear medicine communications. 2019 Sep 16 [Epub ahead of print]

Cigdem Soydal, Mine Araz, Yuksel Urun, Basak Gulpinar, Demet Nak, Elgin Ozkan, Nuriye Ozlem Kucuk

Departments of Nuclear Medicine., Medical Oncology., Radiology, Ankara University Medical Faculty, Ankara, Turkey.