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. 2021 Feb 26;11:591009. doi: 10.3389/fonc.2021.591009

Figure 4.

Figure 4

Subgroup analysis of CEA-elevated and CEA-normal in the training set (A, B), internal validation set (E, F), and external validation set (I, J); Subgroup analysis of grade I–II and grade III–IV in the training set (C, D), internal validation set (G, H), and external validation set (K).