Table 2. Univariate survival analysis of established prognostic features and of the −174G/C IL-6 genotype.

Feature	Relative risk (95% CI)	P
−174G/C IL-6 genotype1	1.99 (1.05–3.77)	0.034
Nodal involvement	2.44 (1.66–3.57)	<0.001
Histological grade	3.28 (1.84–5.85)	<0.001
Tumour size	4.44 (2.19–9.00)	<0.001
Tumour type	1.24 (0.62–2.51)	NS
Oestrogen receptor	1.05 (0.82–1.33)	NS
Progesterone receptor	1.03 (0.82–1.30)	NS
Ploidy	0.99 (0.58–1.70)	NS
ErbB2 amplification	2.05 (1.04–4.03)	0.037

CC vs CG/GG genotypes. For all other factors, the groups compared are the same as those shown in Table 1.