Table 4.

Comparison between HER2 amplified and non-amplified primary breast cancers

Characteristic	n amplified (percentage)	n not amplified (percentage)	p
pT category
pT1	3 (10.3)	26 (89.7)	0.31
pT2	13 (26.5)	36 (73.5)
pT3	2 (28.6)	5 (71.4)
pT4	2 (14.3)	12 (85.7)
Not available	2 (33.3)	4 (66.7)
Nodal status
Positive	14 (21.9)	50 (78.1)	0.44
Negative	4 (14.8)	23 (85.2)
Not available	4 (28.6)	10 (71.4)
Histologal type
Ductal	20 (24.4)	62 (75.6)	0.30
Lobular	2 (16.7)	10 (83.3)
Ductulo-lobular	0	10 (100)
Medullary	0	1(100)
Nuclear grade
1	0	7 (100)	0.01
2	4 (9.8)	37 (90.2)
3	18 (32.7)	37 (67.3)
Not available	0	2 (100)

HER2, gene encoding human EGF-like receptor 2.