Table 4C. Cox regression model, overall survival, all breast cancers with CAIX and chemotherapy as interaction variables (n=441).

	Odds ratio	95% CI	P-value
Grade	1.98	1.34–2.92	0.001
Age	1.00	0.99–1.02	0.65
Size	1.04	1.03–1.05	<0.001
Oestrogen receptor	0.74	0.46–1.20	0.22
Nodal status	2.22	1.15–4.26	0.02
Additions to model
CAIX	1.09	0.49–2.42	0.83
Chemotherapy	0.75	0.38–1.49	0.41
CAIX × chemotherapy	2.65	1.03–6.82	0.04

CAIX=carbonic anhydrase IX.