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Pleural CEA can discriminate MPE from other diseases with an area under the receiver operating characteristic curve (AUC) of 0.806 (95% CI: 0.745–0.867, P < .001). The dotted circle represents a cut-off of 5.3 ng/mL in pleural CEA. AUC = area under the curve, CEA = carcinoembryonic antigen, CI = confidence interval.
