Table 4 Univariate and multivariable Cox analyses of age, T stage, histology type, HR status, molecular type and operation method on disease free survival.

From: Omitting radiotherapy is safe in breast cancer patients ≥ 70 years old after breast-conserving surgery without axillary lymph node operation

Clinical character

Univariable analysis

Multivariate analysis

HRb

95% CI

P value

HRb

95% CI

P value

Age group

70–74

1.00

Ref

 

1.00

Ref

 

75–79

0.93

0.43–2.01

0.86

1.02

0.46–2.26

0.96

80+

1.03

0.48–2.23

0.94

1.32

0.60–2.91

0.50

T stagea

1.16

0.70–1.92

0.575

0.98

0.56–1.72

0.94

Histological typea

1.02

0.74–1.41

0.89

1.29

0.87–1.91

0.21

HRc

0.26

0.14–0.47

0.00

2.00

0.41–9.77

0.39

Molecular typea

1.65

1.37–2.00

0.00

2.15

1.28–3.59

0.004

Operation method

0.87

0.46–1.63

0.66

0.76

0.39–1.47

0.41

  1. aThese clinical features are considered continuous variables, giving the increased hazard ratio per unit.
  2. bHazard ratio.
  3. cHormone receptor.
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