Table 3. Logistic regression analysis of negative factors predictive of ALND involvement.

Probability of a positive ALND
	OR	95%CI	p-value
Subtypes
LA vs LB	1.16	0.45–3,01	0.755
LA vs HS	2.82	1.33–6.00	0.007
LA vs TN	1.56	0.46–5.28	0.476
LVI
Negative vs Positive	58.5	17.10–20.32	<0.0001
Grading
G1+G2 vs G3	1.66	0.82–3.89	0.162
T
T1 vs T2	1.52	0.81–2.85	0.191
OSNA+ vs OSNA++	4.76	2.47–9.19	<0.0001

ALND: axillary lymph node dissection; OR: odd ration; CI: confidence interval; LA: Luminal A; LB: Luminal B; HS: HER2 subtype; TN: Triple Negative; LVI: lymphovascular invasion; OSNA: one step nucleic acid amplification; OSNA+: >250≤5000 cytokeratinn 19 mRNA copies/µl; OSNA++: >5000 cytokeratin 19 mRNA copies/µl.