Table 2 Cox regression analysis for OS in BCS group and BCS + Postoperative RT group.

From: Postoperative radiotherapy for ductal carcinoma in situ: survival prediction and clinical decision support using a nomogram-based approach

Characteristics

BCS

BCS + Postoperative RT

HR (95% CI)

P value

HR (95% CI)

P value

Patient age, years

 

< 0.001

 

< 0.001

≤ 60

REF

 

REF

 

61–70

2.789 (2.471–3.149)

< 0.001

3.160 (2.741–3.642)

< 0.001

71–80

7.897 (7.036–8.862)

< 0.001

8.301 (7.240–9.518)

< 0.001

> 80

20.824 (17.964–24.140)

< 0.001

19.526 (16.390-23.262)

< 0.001

Tumor size (mm)

 

< 0.001

 

= 0.977

≤ 2

REF

 

REF

 

2–10

1.367 (1.098-1.700)

= 0.005

1.016 (0.825–1.252)

= 0.880

> 10

1.866 (1.502–2.319)

< 0.001

1.006 (0.815–1.241)

= 0.955

ER status

 

= 0.095

 

= 0.098

Negative

REF

 

REF

 

Positive

0.907 (0.808–1.017)

= 0.095

0.892 (0.780–1.021)

= 0.098

Nuclear grade

 

= 0.864

 

= 0.214

1

REF

 

REF

 

2

0.997 (0.886–1.122)

= 0.964

1.091 (0.929–1.281)

= 0.287

3

0.971 (0.852–1.107)

= 0.662

0.990 (0.841–1.166)

= 0.906

  1. Significant values are in bold (P value< 0.05).
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