Investigation of 18F-FDG PET/CT Findings and CA-125 Levels in Ovarian Cancer Staging

• Main Authors: Açikgöz, A.S (Author), Akgün, E. (Author), Akovali, B. (Author), Akyel, R. (Author), Kaya Döner, Z.R (Author), Sağer, S. (Author), Şahin, O.E (Author), Sönmezoğlu, K. (Author)
• Format: Article
• Language: English
• Published: Istanbul Tip Fakultesi 2022
• Subjects: 18F labeled fluoro-2-deoxy-D-glucose; cancer antigen-125; ovarian cancer; positron emission tomog-raphy/computed tomography; SUVmax
• Online Access: View Fulltext in Publisher

 OBJECTIVE This study aims are to investigate the role of 18F labeled fluoro-2-deoxy-D-glucose positron emission computed tomography/computed tomography (18F FDG PET/CT) in the initial staging and recurrence detection of ovarian cancer and to compare it with the cancer antigen-125 (CA-125) value. METHODS A total of 93 patients with a primary ovarian cancer diagnosis (Group 1 n=41) or suspicion of recurrent ovarian cancer (Group 2 n=52) were included in this study from January 2007 to January 2013. RESULTS The ages of the patients were between 15 and 82 years. In cases with PET positive lesions (n=84); Ovarian lesion (n=34), infradiaphragmatic lymph node metastasis (n=46), supradiaphragmatic lymph node metastasis (n=14), peritoneal implant (n=67), and distant metastasis (n=14) were detected. Histopathological examination of 4 PET positive ovarian lesions was not compatible with cancer. In 14 cases with low CA-125 value, 18F FDG PET/CT was able to detect primary/recurrent lesions accurately. In the evaluation of primary/recurrent ovarian cancer, 18F FDG PET/CT had 93% sensitivity, 42.8% specific-ity, 89.2% accuracy, whereas CA-125 had 79.1% sensitivity, 42.8% specificity, and 76.3% accuracy. CONCLUSION In conclusion; even in low CA-125 values, 18F FDG PET/CT is a prominent method that can detect especially extra-abdominal distant metastatic foci in the initial staging of primary ovarian cancer and diagnosis and follow-up of recurrent ovarian cancer. © 2022, Turkish Society for Radiation Oncology.