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Assessment of Cell Proliferation in Renal Cell Carcinoma Using Dual-phase F-fluorodeoxyglucose PET/CT

Overview
Journal Oncol Lett
Specialty Oncology
Date 2015 Dec 2
PMID 26622577
Citations 6
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Abstract

The present study aimed to examine the association between F-fluorodeoxyglucose (F-FDG) uptake and cell proliferation markers; in addition, the correlation between F-FDG uptake and biological characteristic in patients with renal cell carcinoma (RCC) was investigated using dual-phase F-FDG-positron emission tomography/computed tomography (PET/CT). Dual-phase F-FDG PET/CT was performed on 31 RCC patients and the maximum standardized uptake values at 1 h (SUV1) and 2 h (SUV2) as well as the retention index (RI; %) in the primary tumors were calculated. Monoclonal antibodies for Ki-67, minichromosome maintenance 2 (MCM2) and topoisomerase II α (topo II α) were used to assess the expression levels of their respective proteins in excised tumor tissue using immunohistochemistry. The results demonstrated that RI and SUV2 in patients with Stage I/II + grade 1 (G1) RCC were significantly decreased compared with all patients with other stages/grades (RI, P=0.0065; SUV2, P=0.043); in addition, significantly increased uptake and RI were detected in patients with metastases compared with patients without metastases (SUV1, P=0.029; SUV2, P=0.0003; RI, P<0.001). All proliferation markers significantly correlated with RI (Ki-67, r=0.501, P=0.004; MCM2, r=0.359, P=0.047; topo II α, r=0.402, P=0.024), while SUV1 and SUV2 correlated with Ki-67 only. In conclusion, the results of the present study demonstrated that dual-phase F-FDG-PET/CT was more useful for predicting cell proliferation in RCC compared with single-phase imaging alone. However, follow-ups are required in order to determine whether dual-phase F-FDG-PET/CT provides independent prognostic information.

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