aThe survival information of 3 patients was not available in German cohort, so these 3 patients were removed from analyses.bFor one patient with liver metastasis in the Maryland cohort, the exact stag
Ref: used as reference values. OR: Odds Ratio; 95% CI: 95% confidence interval; Stage of laryngeal cancer was classified using the UICC-2002 TNM classification system. Characteristics of patients and
Bold italics indicate significant differences (p < 0.05). *Moderately and well differentiated histologic types were classified as differentiated carcinoma; Low levels of differentiation were defined a
