FDG-PET SUVmax Combined with IASLC/ATS/ERS Histologic Classification Improves the Prognostic Stratification of Patients with Stage I Lung Adenocarcinoma |
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Authors: | Kyuichi Kadota MD PhD Christos Colovos MD PhD Kei Suzuki MD Nabil P. Rizk MD Mark P. S. Dunphy DO Emily C. Zabor MS Camelia S. Sima MD MS Akihiko Yoshizawa MD PhD William D. Travis MD Valerie W. Rusch MD Prasad S. Adusumilli MD |
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Affiliation: | Thoracic Service, Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY, USA. |
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Abstract: | Background We investigated the association between the newly proposed International Association for the Study of Lung Cancer (IASLC)/American Thoracic Society (ATS)/European Respiratory Society (ERS) classification and 18F-fluorodeoxyglucose (FDG) uptake on positron emission tomography (PET), and whether the combination of these radiologic and pathologic factors can further prognostically stratify patients with stage I lung adenocarcinoma. Methods We retrospectively evaluated 222 patients with pathologic stage I lung adenocarcinoma who underwent FDG-PET scanning before undergoing surgical resection between 1999 and 2005. Patients were classified by histologic grade according to the IASLC/ATS/ERS classification (low, intermediate, or high grade) and by maximum standard uptake value (SUVmax) (low?<3.0, high???3.0). The cumulative incidence of recurrence (CIR) was used to estimate recurrence probabilities. Results Patients with high-grade histology had higher risk of recurrence (5-year CIR, 29?% [n?=?25]) than those with intermediate-grade (13?% [n?=?181]) or low-grade (11?% [n?=?16]) histology (p?=?0.046). High SUVmax was associated with high-grade histology (p?0.001) and with increased risk of recurrence compared to low SUVmax (5-year CIR, 21?% [n?=?113] vs. 8?% [n?=?109]; p?=?0.013). Among patients with intermediate-grade histology, those with high SUVmax had higher risk of recurrence than those with low SUVmax (5-year CIR, 19?% [n?=?87] vs. 7?% [n?=?94]; p?=?0.033). SUVmax was associated with recurrence even after adjusting for pathologic stage (p?=?0.037). Conclusions SUVmax on FDG-PET correlates with the IASLC/ATS/ERS classification and can be used to stratify patients with intermediate-grade histology, the predominant histologic subtype, into two prognostic subsets. |
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