Table 2 HER2 re-evaluation by serum HER2, CTC, and metastatic tissue

Serum HER2 (n = 77)

77

53

19

5

   HER2 negative

57

41 (77)

15 (79)

1 (20)

   HER2 positive

20

12 (23)

4 (21)

4 (80)

CTC HER2 (n = 21)^a

21

12

6

3

   HER2 negative

13

8 (67)

3 (50)

2 (67)

   HER2 positive

8

4 (33)

3 (50)

1 (33)

Metastatic tissue (n = 10)^b

10

8

2

-

   HER2 negative

8

6 (75)

2 (100)

-

   HER2 positive

2

2 (25)

0

-