CEACAM5 and neoplasm: Moreover, all models performed significantly better than using only tumor size (AUC = 0.753, SD = 0.023, P < 0.001; the cut-off value was 1.5 cm), SUVmax (AUC = 0.734, SD = 0.024, P < 0.001; the cut-off value was 2.8) or CEA (AUC = 0.720, SD = 0.026, p < 0.001; the cut-off value was 2.98 ng/ml).