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OBJECTIVESA new pathological classification for pre- and minimally invasive adenocarcinoma has been established, with distinction prior to surgery crucial because of the extremely good prognosis.METHODSOf 412 patients who underwent surgery for lung cancer from 2008 to 2011, 110 classified as c-stage I had each of the following four parameters assessed for predictive power for pre- or minimally invasive adenocarcinoma and relapse-free survival (RFS): (i) whole tumour size (WS) shown by computed tomography (CT) , (ii) size of the solid (SS) component in CT findings, (iii) maximum standard uptake value in fluorodeoxyglucose positron emission tomography (FDG-PET)/CT scan images (SUVmax) and (iv) serum level of carcinoembryonic antigen.RESULTSFor prediction of pre- or minimally invasive adenocarcinoma, the area under the receiver-operating curve was >0.7 for all the four parameters, while only SS was found to be an independent factor in multivariate logistic regression analysis. In Cox proportional hazard model analysis, SS and SUVmax were statistically significant, and SS was exclusively independent in multivariate analysis. Differences in RFS between T1a and T1b were more pronounced when using SS compared with WS. In the sub-classification of T1a, we used a breakpoint of 1.0 cm in SS (T1a- and T1a-), which resulted in a 2-year RFS rate of 1.00 for T1a- (n 21), 0.89 for T1a- (n 27) and 0.68 for T1b (n 26) (P 0.002 between T1a- and T1b).CONCLUSIONSThe SS parameter was useful to distinguish pre- and minimally invasive adenocarcinoma from other types of lung cancer, and set a T1a sub-classification.
European Journal of Cardio-Thoracic Surgery – Oxford University Press
Published: Feb 18, 2014
Keywords: Non-small-cell lung cancer Computed tomography Invasive adenocarcinoma SUV max Carcinoembryonic antigen Surgery
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