Table 4.

Clinical and pathological tumor stages of HER2 positive patients

Tumor stage	Clinical stage “cT” (sonography)	Pathological stage “pT” (histology)	Accordance	Underdiagnosis	Overdiagnosis
1a	2 (2.6%)	3 (3.9%)	2 (100%)	0	0
1b	8 (10.4%)	7 (9.1%)	5 (62.5%)	2 (25.0%)	1 (12.5%)
1c	24 (31.2%)	24 (31.2%)	17 (70.8%)	6 (25%)	1 (4.2%)
2	41 (53.2%)	40 (51.9%)	35 (85.4%)	0	6 (14.6%)
3	2 (2.6%)	3 (3.9%)	2 (100%)	0	0
total	77 (100%)	77 (100%)

Numbers are presented as frequencies (= n) and percentages (%). Accordance of tumor stage, underdiagnosis and overdiagnosis refers to clinical stage “cT”