Table 2.

Overall results of sentinel node analysis

Parameter	Histology n = 35,143	%	OSNA n = 1086	%	P-value
Macrometastasis	4449	12.7	116	10.7	0.053
Micrometastasis	2771	7.9	162	14.9	< 0.001
Axillary therapy*					0.083
Yes	5046	14.4	155	14.3
No	29,937	85.2	931	85.7
Unknown	160	0.5	0	0.0
Axillary lymph node dissection	723	2.1	60	5.5	< 0.001
Axillary radiotherapy					< 0.001
Yes	4323	12.3	95	8.7
No	30,660	87.2	991	91.3
Unknown	160	0.5	0	0.0
Chemotherapy**	6655	18.9	229	21.1	0.075
Endocrine therapy	17,852	50.8	497	45.8	0.001
Chemotherapy and endocrine therapy	4873	13.9	133	12.2	0.128

Significant differences are bold

^*Axillary lymph node dissection or axillary radiotherapy

**Chemotherapy with or without (targeted) immunotherapy. Statistical analysis was performed using Pearson Chi-square test