• Yukihiro Umeda, Yoshiki Demura, Miwa Morikawa, Masaki Anzai, Maiko Kadowaki, Shingo Ameshima, Tatsuro Tsuchida, Tetsuya Tsujikawa, Yasushi Kiyono, Hidehiko Okazawa, Takeshi Ishizaki, and Tamotsu Ishizuka.
• Third Department of Internal Medicine, University of Fukui, Yoshida-gun, Fukui, Japan umeda@u-fukui.ac.jp.
• J. Nucl. Med. 2015 Dec 1; 56 (12): 1869-75.

UnlabelledThe aim of this prospective study was to clarify whether dual-time-point (18)F-FDG PET imaging results are useful to predict long-term survival of idiopathic pulmonary fibrosis (IPF) patients.MethodsFifty IPF patients underwent (18)F-FDG PET examinations at 2 time points: 60 min (early imaging) and 180 min (delayed imaging) after (18)F-FDG injection. The standardized uptake value (SUV) at each point and retention index value (RI-SUV) calculated from those were evaluated, and then the results were compared with overall and progression-free survival.ResultsA multivariate Cox proportional hazards model showed higher RI-SUV and higher extent of fibrosis score as independent predictors of shorter progression-free survival. The median progression-free survival for patients with negative RI-SUV was better than that for those with positive RI-SUV (27.9 vs. 13.3 mo, P = 0.0002). On the other hand, multivariate Cox analysis showed higher RI-SUV and lower forced vital capacity to be independent predictors of shorter overall survival. The 5-y survival rate for patients with negative RI-SUV was better than that for those with positive RI-SUV (76.8% vs. 14.3%, P = 0.00001). In addition, a univariate Cox model showed that positive RI-SUV as a binary variable was a significant indicator of mortality (hazard ratio, 7.31; 95% confidence interval, 2.64-20.3; P = 0.0001).ConclusionOur results demonstrate that positive RI-SUV is strongly predictive of earlier deterioration of pulmonary function and higher mortality in patients with IPF.© 2015 by the Society of Nuclear Medicine and Molecular Imaging, Inc.

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