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Figure 2: The correlation between OS of patients and the basal serum CEA level. Two hundred fifty-three patients were followed up for OR. The median OS was 473 days. The Kaplan-Meier survival analysis and log-rank test were performed to examine the correlation between OS of patients and the basal serum CEA level. The upper limit of the CEA normal value was 9.7 ng/mL. The blue curve indicates the baseline serum CEA <9.7 ng/mL, while the green curve indicates the baseline serum CEA >9.7 ng/mL. Log-rank test unveiled no strongly significant difference between these two (P = 0.079)

Figure 2: The correlation between OS of patients and the basal serum CEA level. Two hundred fifty-three patients were followed up for OR. The median OS was 473 days. The Kaplan-Meier survival analysis and log-rank test were performed to examine the correlation between OS of patients and the basal serum CEA level. The upper limit of the CEA normal value was 9.7 ng/mL. The blue curve indicates the baseline serum CEA <9.7 ng/mL, while the green curve indicates the baseline serum CEA >9.7 ng/mL. Log-rank test unveiled no strongly significant difference between these two (<i>P</i> = 0.079)