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Interrelationship of independent prognostic factors according to logistic regression analyses. White boxes are independent prognostic factors. Gray boxes are dependent prognostic factors. These factors reflect associated independent prognostic factors. CEA, carcinoembryonic antigen; LNDE, Iymph node dissection extent; ND20, lymph node metastasis density over 20%; pN, lymph node mitastasis status; T, tumor factor.
