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. 2013 Jun 30;29(3):106–114. doi: 10.3393/ac.2013.29.3.106

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© 2013 The Korean Society of Coloproctology

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 3 — Receiver operating characteristic (ROC) curve of the preoperative serum carcinoembryonic antigen (CEA) level relative to tumor recurrence in each stage. (A) Optimal cutoff CEA value in stage I was 7.4 (area under curve = 0.635, P = 0.315). (B) Optimal cutoff CEA value in stage II was 5.5 (area under curve = 0.660, P = 0.010). (C) Optimal cutoff CEA value in stage III was 4.5 (area under curve = 0.616, P = 0.003). (D) Optimal cutoff CEA value in stage N0 was 5.5 (area under curve = 0.670, P = 0.002). (E) Optimal cutoff CEA value in stage N1 was 4.8 (area under curve = 0.601, P = 0.082). (F) Optimal cutoff CEA value in stage N2 was 3.5 (area under curve = 0.591, P = 0.118).