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Kaplan-Meier survival based on serum carcinoembryonic antigen (CEA) levels. (A) Patients with CEA ≤ 100 ng/mL had improved overall survival compared with those with CEA > 100 ng/mL (41.8 vs. 15.5 mo; P = 0.013). (B) Patients with CEA ≤ 100 ng/mL had improved progression-free survival compared with those with CEA > 100 ng/mL (21.6 vs. 6.3 mo; P = 0.006).
