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Table 2 Serum concentrations of CEA, CYFRA21-1, and SLX in pN0 and skip N2 patients

From: Sialyl Lewis X as a predictor of skip N2 metastasis in clinical stage IA non-small cell lung cancer

  Number of patients Mean serum level (95% CI) P-value
Pathological N0 Skip N2 Pathological N0 Skip N2  
CEA (ng/mL) 230 12 5.3 (4.5, 6.0) 5.4 (3.5, 7.4) 0.196
CYFRA21-1 (ng/mL) 219 12 1.4 (1.3, 1.6) 1.8 (0.6, 2.9) 0.936
SLX (U/mL) 211 12 22.9 (21.7, 24.1) 28.0 (23.5, 32.6) 0.015
CEA: carcinoembryonic antigen; CYFRA: cytokeratin 19 fragment; SLX: sialyl Lewis X   Mann-Whitney U-test