Similar results were obtain upon analysis in the internal validation dataset (C‐index: nomogram, 0.930; CT estimation, 0.920; tumor differentiation type, 0.620; CEA level, 0.540) and the primary dataset (C‐index: nomogram, 0.940; CT estimation, 0.920; tumor differentiation type, 0.630; CEA level, 0.580). Here, CEACAM5 is linked to neoplasm.