Table 1.

Patient and tumor characteristics (N = 3904 women)

Characteristic
Age, years
median (min, max)	57 (23, 95)
≤ 50, n (%)	1030 (26.4%)
> 50, n (%)	2874 (73.6%)
Tumor histology, n (%)
ductal	3094 (79.4%)
lobular	319 (8.2%)
both	97 (2.5%)
other	389 (10.0%)
missing, n	5
Lymphovascular invasion, n (%)
absent	3024 (88.4%)
present	396 (11.6%)
missing, n	484
Tumor size, cm
median (min, max)	1.4 (0.0, 19.0)
≤ 1.0, n (%)	1597 (43.6%)
1.1 – 2.0, n (%)	1609 (44.0%)
> 2.0, n(%)	455 (12.4%)
missing, n	243
HR status, n (%)
ER or PR positive	3084 (83.8%)
both negative	596 (16.2%)
missing, n	224
Clinical stage, n (%)
T1	3206 (87.6%)
T2	447 (12.2%)
T3	8 (0.2%)
missing, n	243
Tumor Grade, n (%)
I	1225 (33.8%)
II	1479 (40.8%)
III	918 (25.4%)
Missing, n	282

HR – hormone receptor; ER – estrogen receptor; PR – progesterone receptor