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Table 3 HER2 status of primary and matched recurrent lesion by immunohistochemistry*

From: A retrospective study investigating the rate of HER2 discordance between primary breast carcinoma and locoregional or metastatic disease

PRIMARY

RECURRENCE

 

HER2 negative

HER2 inconclusive

HER2 positive

HER2 negative

50

8

2

HER2 inconclusive

4

5

2

HER2 positive

2

3

22

Total

56

16

26

  1. *Eighteen patients, where immunohistochemistry was not performed by the local laboratory on primary or recurrence, were excluded.