Table 2.

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

	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