Table 4. Prognostic factors related to axillary lymph node invasion in early (T1) breast cancer: multivariate analysis stratified by progesterone receptor expression.

	Tumours without progesterone receptors			Tumours with progesterone receptors
	OR	95% CI	P-value	OR	95% CI	P-value
Tumour size
>1 cm	1			1
⩽1 cm	0.53	0.07–3.74	0.522	0.27	0.07–1.02	0.053
uPA–PAI-1
Negative	1			1
Positive	1.24	0.26–6.00	0.790	13.79	1.95–97.4	0.009
ER
ER−	1
ER+	0.55	0.09–3.27	0.513	—	—	—
Histologic grade
1–2	1			1
3	0.75	0.14–3.96	0.737	6.68	1.39–32.1	0.018
Ki67
⩽10%	1			1
>10%	7.68	0.68–3.96	0.099	1.48	0.45–4.89	0.517
CD44
Positive	1			1
Negative	13.37	2.89–61.7	0.001	4.50	1.28–15.9	0.019