Table 3. Multivariate analysis of various predictive factors for the presence of non-sentinel node metastases.

Factors	Odds ratio (95% CI)	P -value
Pathological tumour size
⩽2 cm vs >2 cm	2.600 (1.137–5.946)	0.024
Nuclear grade
1+2 vs 3	1.051 (0.337–3.279)	0.932
Oestrogen receptor status
Absent vs present	0.996 (0.267–3.716)	0.995
HER2 status
Negative + unknown vs positive	1.855 (0.647–5.321)	0.25
Lymphovascular invasion
Absent vs present	3.472 (1.230–9.799)	0.019
CK19 mRNA in SLN (copies μl−1)
<5.0 × 103 vs ⩾5.0 × 103	3.757 (1.569–8.997)	0.003

Abbreviations: CI=confidence interval; CK19=cytokeratin 19; SLN=sentinel lymph node.