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Table 1 Clinical data of patients

From: Determination of HER2 status using both serum HER2 levels and circulating tumor cells in patients with recurrent breast cancer whose primary tumor was HER2 negative or of unknown HER2 status

 

Number

%

Age

  

   <50 years

17

22

   ≥50 years

60

78

Primary tumor size

  

   pT1

25

32

   pT2-4

40

52

   PTx

12

16

Nodal status

  

   No

22

29

   N1

39

51

   Nx

16

21

Grading

  

   I to II

35

45

   III

24

31

   Unknown

18

23

Estrogen receptor status

  

   Negative

20

26

   Positive

45

58

   Unknown

12

16

Progesterone receptor status

  

   Negative

25

33

   Positive

39

50

   Unknown

13

17

HER2 statusa

  

   Negative

44

57

   Unknown

33

43

Localization of metastases

  

   Visceral

25

33

   Bone

13

17

   Multiple/other

39

51

  1. A total of 77 patients were included in this study. aHuman epidermal growth factor receptor (HER)2 status at the time of study inclusion; in 14 patients HER2 status could be determined from archival tissue (five HER2-positive patients and nine HER2-negative patients).