Table 3 Cox proportional hazards regression model multivariate analysis of the overall survival and breast cancer-specific survival in PR-negative cohort (forward: LR)

 ≤ 40

Reference

–

–

 41–55

0.795 (0.365–1.733)

0.564

–

–

 56–70

0.812 (0.387–1.705)

0.582

–

–

 71–85

1.485 (0.695–3.173)

0.308

–

–

 > 85

2.834 (1.087–7.389)

0.033

–

–

 T1

Reference

Reference

 T2

2.047 (1.443–2.902)

< 0.001

2.177 (1.379–3.436)

0.001

 T3

5.696 (3.107–10.444)

< 0.001

5.507 (2.749–11.034)

< 0.001

 T4

2.565 (1.567–4.201)

< 0.001

3.306 (1.825–5.989)

< 0.001

 TX

0.536 (0.143–2.013)

0.356

1.296 (0.365–4.598)

0.688

 N0

Reference

Reference

 N1

1.244 (0.864–1.791)

0.241

1.382 (0.869–2.199)

0.172

 N2

2.415 (1.544–3.779)

< 0.001

2.379 (1.381–4.098)

0.002

 N3

2.264 (1.605–4.290)

< 0.001

3.509 (1.993–6.181)

< 0.001

 NX

2.954 (1.212–7.201)

0.017

3.073 (1.163–8.120)

0.024

 M0

Reference

Reference

 M1

2.311 (1.452–3.677)

< 0.001

3.200 (1.902–5.383)

< 0.001

 Done

Reference

Reference

 Not

2.143 (1.130–4.064)

0.020

3.120 (1.621–6.006)

0.001

 Unknown

2.629 (0.336–20.549)

0.357

1.683 (0.215–13.191)

0.62

 Yes

Reference

–

–

 No/unknown

1.492 (1.073–2.076)

0.017

–

–