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Receiver operator characteristic curves for CEA (A), HNPs 1–3 (B) and MIF (C). Curves for cancer vs control are shown as solid lines, early cancer vs control as dashed lines and late cancer vs control as dotted lines. The areas under the ROC curves are for CEA: 0.567, 0.526 and 0.636, HNPs 1–3: 0.629, 0.628 and 0.630, MIF: 0.853, 0.820 and 0.907 (non-cancer vs all cancer, early cancer and late cancer, respectively).
