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(18)F-fluorodeoxyglucose-positron emission tomography/computed tomography aids staging and predicts mortality in patients with muscle-invasive bladder cancer

Laura S. Mertens, M. Carmen Mir, Andrew M. Scott, Sze Ting Lee, Annemarie Fioole-Bruining, Erik Vegt, Wouter V. Vogel, Rustom Manecksha, Damien Bolton, Ian Davies, Simon Horenblas, Bas W.G. van Rhijn, Nathan Lawrentschuk

Urology. 2014 Feb;83(2):393-8

Abstract


OBJECTIVE:
To investigate the association between extravesical (18)F-fluorodeoxyglucose (FDG) avid lesions on FDG-positron emission tomography/computed tomography (PET/CT) and mortality in patients with muscle-invasive bladder cancer.

METHODS:
An international, bi-institutional cohort study of 211 patients with muscle-invasive bladder cancer who underwent staging CT and FDG-PET/CT imaging. On the basis of the presence of extravesical FDG-avid lesions suspicious for malignancy on PET/CT images, patients were divided into a PET/CT-positive and PET/CT-negative group. Data on staging and mortality were retrospectively analyzed from prospective databases. Kaplan-Meier analyses were performed to compare overall (OS) and disease-specific survival (DSS) between the groups. Multivariable Cox regression models were used to investigate the association between extravesical PET/CT lesions and mortality. Extravesical lesions suspicious for malignancy on conventional CT were included in the models.

RESULTS:
Of the 211 patients, 98 (46.4%) had 1 or more extravesical lesions on PET/CT, 113 (53.5%) had a negative PET/CT. Conventional CT revealed extravesical lesions in 51 patients (24.4%). Median follow-up was 18 months. Patients with a positive PET/CT had a significantly shorter OS and DSS (median OS: 14 vs 50 months, P = .001; DSS: 16 vs 50 months, P <.001). In multivariable analysis, the presence of extravesical lesions on PET/CT was an independent prognostic indicator of mortality (OS: hazard ratio = 3.0, confidence interval 95% 1.7-5.1). This association was not statistically significant for conventional CT (hazard ratio = 1.6 (95% confidence interval 0.9-2.7).

CONCLUSION:
On the basis of our results, the presence of extravesical FDG-avid lesions on PET/CT might be considered an independent indicator of mortality.

Copyright © 2014 Elsevier Inc. All rights reserved.

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