Table 1b.

Tumor characteristics (N=101, 1 patient with bilateral breast cancer)

Tumor dimension (cm)
Median	9 mm
Range	1.2mm –19mm
<1 cm	56 (55%)
>1cm and <2 cm	45 (45%)
Histology
Invasive ductal	74 (75%)
Invasive lobular	16 (16%)
Invasive tubular	6 (6%)
Invasive Ductal+Lobular	1 (1%)
Invasive colloid	2 (2%)
N/A*	1
Nodal Status
N0	101** (100%)
pN0 at sentinel node or axillary dissection	96 (96%)
No nodal assessment because of <5mm primary	5 (5%)
ER+	99 (99%)
ER−	1 (1%)
PR+	65 (65%)
PR−	35 (35%)
HER2 (+)
Yes	5** (5%)
No	93 (95%)
N/A	2
Ki67 (available in 78/100)
Proliferation <14%	68 (87%)
Proliferation >14%	9 (11%)

^*insufficient tissue to perform the test

^**one patient with bilateral breast cancer

^***1pt received trastuzumab