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Overall survival curves of patients with different subgroups, grouped by pathological types. (A–C) K-M curves for OS in ADC, SCC, and Others. (D) K-M curve for OS in ADC using a CEA cut-off of 10 ng/ml. aGroup A vs. Group C, p < 0.001; Group A vs. Group B, p = 0.014; Group B vs. Group C, p < 0.001. bGroup A vs. Group B, p < 0.001; Group A vs. Group C, p < 0.001; Group B vs. Group C, p = 0.029.
