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Receiver operating characteristic curve for serum sialyl Lewis X (SLX) in pathological (p)N0 and skip N2 patients. The area under the curve (AUC) = 0.710. The calculated optimal cutoff point for serum SLX concentration was 21.4 U/mL (Youden index = 0.433), and the sensitivity was 91.7% (11 of 12 skip N2 patients), whereas the specificity was 51.7% (109 of 211 pN0 patients).
