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• W2600668723 abstract "e22051 Background: Carcinoma of unknown primary (CUP) is a heterogeneous group of tumors and usually follows an aggressive biological and clinical behavior. Difficult challenges in oncology which the identification of the primary tumor and a complete disease staging could offer a more rational and efficient treatment in order to improve the survival time. Our aim was to evaluate the role of 18 F-FDG PET/CT scan with two aspects: detection of the primary site, and estimation of tumor biological behavior which essential for the development of new, individual and targeted effective therapies. Methods: One hundred and seventeen patients presenting with histologically confirmed metastatic carcinoma (76 lymph nodes, 41 visceral biopsy proven) of unknown primary site were included in this retrospective study. The evaluations as follows had not revealed a primary site: detailed medical history, full physical and laboratory examinations, and diagnostic imaging methods. All patients underwent PET/CT. Results: In 42 (35.90%) patients, a primary tumor site which was confirmed by follow-up or surgery was showed by PET/CT. In 15 (12.82%) patients, the primary tumor site was suggested by PET/CT but not confirmed. In 60 (51.28%) patients, the primary tumor site was not localized modifying the stage of disease. In the other 17 (14.53%) patients, PET/CT scan identified further unexpected metastases. Overall, the following oncological treatment was influenced by the PET/CT scan, in a total of 38 (32.47%) patients. Between the adenocarcinoma and squamous cell carcinoma groups, no significant difference in SUVmax was found ( t=1.191, p = 0.244). A significantly higher SUVmax was found among patients with poorly or undifferentiated carcinoma compared with patients with well to moderately ( t=4.013, p<0.01) differentiation; In 42 patients with a confirmed primary tumor site, the SUVmax of Metastatic tumours have a closely relationship correlate with those of primary tumours, ( r=0.738, p<0.01). Furthermore, a significantly higher SUVmax was found among metastases compared with primary tumors ( t=3.470, p<0.01). Conclusions: Our data strongly support 18 F-FDG PET/ CT imagings not only provide new insights in the diagnosis and staging of patients with CUP, but also evaluate biologic characters of tissue. 1 No significant financial relationships to disclose." @default.
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• W2600668723 date "2009-05-20" @default.
• W2600668723 modified "2023-09-27" @default.
• W2600668723 title "The role of whole body 18F-FDG PET/CT scan in patients with carcinoma of unknown primary" @default.
• W2600668723 doi "https://doi.org/10.1200/jco.2009.27.15_suppl.e22051" @default.
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