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Table 4 Time to progression (TTP) according to biomarkers expression considered as per clinical practicea

From: Androgen receptor in advanced breast cancer: is it useful to predict the efficacy of anti-estrogen therapy?

 

No.

HR (95% CI)b

Median TTP, months (95% CI)

p

AR status

  < 1%

17

1.00

12.0 (4.3-48.1)

 

  ≥ 1%

85

0.96 (0.56-1.66)

16.1 (13.0-19.0)

0.884

  < 10%

26

1.00

13.8 (11.0-42.1)

 

  ≥ 10%

76

0.98 (0.61-1.57)

16.0 (13.0-19.0)

0.935

AR/ER ratio

  < 0.90 (best cutoff)

52

1.00

12.9 (11.0-17.1)

 

  ≥ 0.90 (best cutoff)

50

0.83 (0.55-1.24)

18.0 (14.0-24.6)

0.362

AR/PgR ratio

  < 0.96 (best cutoff)

34

1.00

16.8 (12.1-47.9)

 

  ≥ 0.96 (best cutoff)

68

1.65 (1.05-2.61)

16.0 (12.4-19.0)

0.028

PgR status

  < 1%

22

1.00

10.5 (4.0-17.0)

 

  ≥ 1%

80

2.18 (1.34-3.55)

17.0 (14.0-24.7)

0.001

Ki67 status

  < 20%

63

1.00

17.6 (14.8-22.1)

 

  ≥ 20%

38

1.60 (1.05-2.45)

12.0 (8.2-16.1)

0.028

HER2 status

 negative

88

1.00

15.8 (12.9-19.0)

 

 positive

14

1.15 (0.65-2.02)

18.0 (7.0-46.0)

0.929

  1. Abbreviations: ER estrogen receptor, PgR progesterone receptor, AR androgen receptor, HER2 human epidermal growth factor receptor 2
  2. abiomarker measured on metastatic sample when a metastatic biopsy was available, or on primary tumor when biopsy of metastasis had not been performed
  3. bHR hazard ratio