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Table 1 Summary of histological, immunohistochemical and chromogenic in situ hybridization findings

From: Metaplastic breast carcinomas exhibit EGFR, but not HER2, gene amplification and overexpression: immunohistochemical and chromogenic in situ hybridization analysis

Case

Histological type

HER2 (Herceptest®)

HER2 (CB11)

EGFR (IHC)

EGFR (CISH)

1

Carcinoma with squamous metaplasia

-

-

3+

No amp

2

Carcinoma with squamous metaplasia

-

-

3+

No amp

3

Carcinoma with squamous metaplasia

-

-

3+

No amp

4

Carcinoma with squamous metaplasia

-

-

3+

No amp

5

Carcinoma with squamous metaplasia

-

-

3+

Amp

6

Carcinoma with squamous metaplasia

-

-

3+

Amp

7

Carcinoma with squamous metaplasia

1+

-

3+

No amp

8

Carcinoma with squamous metaplasia

-

-

3+

Amp

9

Carcinoma with squamous metaplasia

-

-

1+

No amp

10

Spindle cell carcinoma

-

-

3+

No amp

11

Spindle cell carcinoma

-

-

3+

No amp

12

Spindle cell carcinoma

-

-

1+

No amp

13

Spindle cell carcinoma

-

-

3+

Amp

14

Spindle cell carcinoma

-

-

-

No amp

15

Spindle cell carcinoma

-

-

3+

Amp

16

Spindle cell carcinoma

-

-

-

No amp

17

Spindle cell carcinoma

-

-

3+

Amp

18

Spindle cell carcinoma

-

-

3+

No amp

19

Spindle cell carcinoma

2+a

1+a

3+

Amp

20

Carcinoma with heterologous elements

-

-

3+

No amp

21

Carcinoma with heterologous elements

-

-

3+

No amp

22

Matrix producing carcinoma

-

-

1+

No amp

23

Matrix producing carcinoma

-

-

-

No amp

24

Matrix producing carcinoma

-

-

3+

No amp

25

Matrix producing carcinoma

-

-

3+

No amp

  1. aNo HER2 gene amplification was detected by CISH. Amp, amplification; CISH, chromogenic in situ hybridization; EGFR, epidermal growth factor receptor; HER, epidermal growth factor receptor; IHC, immunohistochemistry.