Table 4.

Cox regression analysis

		Overall survival		Disease-free survival
Prognostic factor	Level	Hazard ratio (95% CI)	p value	Hazard ratio (95% CI)	p value
Basal	CK14-positive	0.78 (0.56–1.08)	0.14	0.72 (0.52–0.99)	0.05
Age group in years	<35	1.0	0.0005	1.0	0.005
	35–49	0.86 (0.54–1.37)		0.96 (0.60–1.52)
	50–64	0.77 (0.49–1.22)		0.80 (0.51–1.26)
	65+	1.50 (0.91–2.46)		1.43 (0.87–2.36)
Tumour size	p1	1.0	0.052	1.0	0.042
	p2	1.45 (0.84–2.48)		1.40 (0.83–2.36)
	p3	1.87 (1.06–3.31)		1.92 (1.10–3.33)
Lymph node metastasis	Positive	1.83 (1.42–2.35)	<0.0001	1.81 (1.42–2.32)	<0.0001

Tumour sizes: p1, <2 cm; p2, 2–5 cm; p3, >5 cm. CI, confidence interval; CK14, cytokeratin 14.