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[F-18]-fluorodeoxy-D-glucose-positron Emission Tomography Response is Associated with Outcome for Extremity Osteosarcoma in Children and Young Adults

Overview
Journal Cancer
Publisher Wiley
Specialty Oncology
Date 2009 Jun 12
PMID 19517457
Citations 43
Authors
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Abstract

Background: Response to neoadjuvant chemotherapy is 1 of the most powerful prognostic factors for extremity osteosarcoma. [F-18]-fluorodeoxy-D-glucose-positron emission tomography (FDG-PET) is a noninvasive imaging modality that is used to predict histopathologic response. To determine the prognostic value of FDG-PET response for progression-free survival (PFS) in osteosarcoma, the authors of this report reviewed the University of Washington Medical Center experience.

Methods: Forty patients with extremity osteosarcoma were evaluated by FDG-PET. All patients received neoadjuvant and adjuvant chemotherapy. FDG-PET standard uptake values (SUVs) before neoadjuvant chemotherapy (SUV1) and after neoadjuvant chemotherapy (SUV2) were analyzed and correlated with histopathologic response.

Results: The median SUV1 was 6.8 (range, 3.0-24.1), the median SUV2 was 2.3 (range, 1.2-12.8), and the median SUV2 to SUV1 ratio (SUV2:1), was 0.36 (range, 0.12-1.10). A good FDG-PET response was defined as an SUV2<2.5 or an SUV2:1<or=0.5. FDG-PET responses according to SUV2 and SUV2:1 were concordant with histologic response in 58% and 68% of patients, respectively. SUV2 was associated with outcome (4-year PFS, 73% for SUV2<2.5 vs 39% for SUV2>or=2.5; P=.021). Both the initial disease stage and the histologic response were associated with outcome.

Conclusions: FDG-PET imaging of extremity osteosarcoma was correlated only partially with a histologic response to neoadjuvant chemotherapy. An SUV2<2.5 was associated with improved PFS. Future prospective studies are warranted to determine whether FDG-PET imaging may be used as a predictor of outcome independent of initial disease stage.

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