Table 1.

Patient characteristics (MRI group) according to tumor size estimation and discordance between MRI and histology

	Overestimation MRI – Histol. > 10 mm	Difference MRI – Histol. ≤10 mm	Underestimation MRI – Histol. > 10 mm	Unknown	Total
Number of patients (% of total)	11 (4.44)	159 (64.11)	54 (21.77)	24 (9.68)	248 (100.00)
Age at initial visit [years]
Mean	43.27	52.06	52.19	49.33	51.43
SD	6.18	11.31	11.29	9.47	11.08
Median	44.00	52.00	53.00	50.00	52.00
Min	26.00	25.00	30.00	34.00	25.00
Max	50.00	78.00	75.00	70.00	78.00
N.d.	0	2	0	0	2
Central grade, N (%)
1	0 (0.00)	4 (80.00)	1 (20.00)	0 (0.00)	5 (100.00)
2	5 (4.49)	66 (65.35)	22 (21.78)	8 (7.92)	101 (100.00)
3	6 (4.29)	88 (62.86)	30 (21.43)	16 (11.43)	140 (100.00)
N.d.	0 (0.00)	1 (50.00)	1 (50.00)	0 (0.00)	2 (100.00)
Clinical baseline characteristics, N (%)
cT
1	5 (4.59)	80 (73.39)	19 (17.43)	5 (4.59)	109 (100.00)
2	6 (4.72)	78 (61.42)	29 (22.83)	14 (11.02)	127 (100.00)
3	0 (0.00)	1 (10.00)	5 (50.00)	4 (40.00)	10 (100.00)
4	0 (0.00)	0 (0.00)	1 (50.00)	1 (50.00)	2 (100.00)
cN
0	6 (3.66)	121 (73.78)	30 (18.29)	7 (4.27)	164 (100.00)
1	5 (6.85)	34 (46.58)	21 (28.77)	13 (17.81)	73 (100.00)
2	0 (0.00)	4 (40.00)	3 (30.00)	3 (30.00)	10 (100.00)
3	0 (0.00)	0 (0.00)	0 (0.00)	1 (100.00)	1 (100.00)
Menopausal status, N (%)
Premenopausal	11 (9.24)	72 (60.50)	23 (19.84)	13 (10.92)	119 (100.00)
Postmenopausal	0 (0.00)	80 (67.23)	28 (23.53)	11 (9.24)	119 (100.00)
Unknown/unclear	0 (0.00)	7 (70.00)	3 (30.00)	0 (0.00)	10 (100.00)
BC subtype, N (%)
HR+/HER2+	5 (4.72)	66 (62.26)	30 (28.30)	5 (4.72)	106 (100.00)
HR−/HER2−	6 (6.52)	62 (67.39)	13 (14.13)	11 (11.96)	92 (100.00)
HR−/HER2+	0 (0.00)	31 (62.00)	11 (22.00)	8 (16.00)	50 (100.00)