Table 4 Cox multivariable analysis for breast cancer-specific survival (BCSS) in the BCCA cohorta

From: αB-crystallin expression in breast cancer is associated with brain metastasis

Variables

HR

95% CI

P-value

Age at diagnosis, years

  

0.022

 >55 (n=1,790)

1

  

 <40 (n=239)

1.2

0.91–1.5

0.22

 40–55 (n=946)

0.87

0.72–1.0

0.12

Grade

1.5

1.3–1.8

 

 3 (n=1,643) vs. 2/1 (n=1,332)

  

<0.0001

Nodal status

2.6

2.1–3.0

 

 Positive (n=1,686) vs. negative (n=1,289)

  

<0.0001

Tumor size, cm

  

<0.0001

2 (n=1,545)

1

  

 2–5 (n=1,290)

1.6

1.4–1.8

<0.0001

 >5 (n=140)

2.2

1.6–2.8

<0.0001

Initial systemic therapy

 Any hormonal (n=1,128) vs. none (n=1,847)

0.88

0.74–1.1

0.16

 Any chemo (n=773) vs. none (n=2,202)

0.86

0.69–1.1

0.14

Biomarkers

 ER-positive (n=2,148) vs. negative (n=827)

0.89

0.75–1.1

0.18

 HER2-positive (n=414) vs. negative (n=2,561)

1.4

1.2–1.7

<0.0001

 αB-crystallin-positive (n=332) vs. negative (n=2,643)

1.3

1.1–1.6

0.014

  1. Abbreviations: BCCA, British Columbia Cancer Agency; CI, confidence interval; ER, estrogen receptor; HER2, human estrogen receptor-2; HR, hazards ratio.
  2. an=2,972 cases with complete covariate data, also excluding 3 cases censored before the first event.