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Patient stratification for overall survival by CRS. Kaplan-Meier survival estimates comparing low-CRS (0-2) vs. high-CRS (3–5) groups. The median overall survival was 25 months in the high-CRS group, but it was not reached in the low-CRS group (P = .005). Fourteen patients did not have preoperative CEA levels and were excluded from the analysis. Numbers below the figure are life tables designating how many patients are represented in the survival curves.
