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Multivariate analysis of prognostic impact of chromosomal abnormalities showing that gain of the 15q11.1 chromosomal region and CEA serum levels are the only statistically significant independent predictors of disease-free survival (DFS) (Panel A). Lymph node involvement (N1) also showed a prognostic impact on overall survival (OS) (Panel B) in the multivariate analysis. Survival analysis parameters are indicated with #.
