Application of 18F-FDG PET/CT in patients with synchronous multiple primary carcinoma

Abstract

Objective: To investigate the value of 18F-fluorodeoxyglucose (18F-FDG) PET/CT in detection of synchronous multiple primary carcinoma (MPC) before treatment. Methods: The pre-treatment whole body PET/CT images of seventy-two patients with synchronous MPC confirmed by postoperative and biopsy pathology were analyzed. The pathological results were used as gold standard, and the detection rates of tumor lesions by 18F-FDG PET/CT and plain CT were compared, and the metabolism of 18F-FDG in tumor lesion was analyzed. Results: There were 151 lesions confirmed by pathology in 72 patients with synchronous MPC. The detection rate of tumor lesions by 18F-FDG-PET/CT was 88.1% (133/151), which was significantly higher than that of integrated CT (78.8%, 119/151) (P < 0.05). In patients with first primary cancer in digestive tract and second primary cancer in lung, the maximal standardized uptake value (SUVmax) of first primary cancer in digestive tract was higher than that of second primary cancer in lung (P = 0.042). There was no significant difference in SUVmax between synchronous MPCs in digestive tract (P = 0.345), but there was significant difference in SUVmax between synchronous MPCs in lung (P = 0.046). There were differences in SUVmax among tumor tissue lesions (P < 0.001), and the SUVmax of digestive tract cancer was higher than that of lung cancer (P = 0.01). Conclusion: The whole body 18F-FDG PET/CT imaging can effectively detect and diagnose the synchronous MPC. DOI:10.3781/j.issn.1000-7431.2018.44.731