It is clear that the role exerted by age on relative survival is much weaker – although still statistically significant – than that on overall survival, but shows a clear trend to decrease in the elderly, in contrast with the marked increase with respect to overall survival.
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New insights into the role of age and carcinoembryonic antigen in the prognosis of colorectal cancer.
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The sentences
The level of CEA is better related to survival than is the level of CA19-9, although it retains a clearly prognostic role only for relative survival (while it approaches statistical significance for overall survival).