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Table 4 Multivariate Cox regression analyses of overall survival for T1a, T1b, and T1c breast cancer patients in the matched cohort

From: Impact of adjuvant chemotherapy on T1N0M0 breast cancer patients: a propensity score matching study based on SEER database and external cohort

Variables

T1a

T1b

T1c

Multivariate Analysis

Multivariate Analysis

Multivariate Analysis

HR (95%CI)

P-value

HR (95%CI)

P-value

HR (95%CI)

P-value

GRADE

 I

reference

 

reference

 

reference

 

 II

2.17(0.98–4.83)

0.06

1.01(0.89–1.14)

0.92

1.25(0.95–1.63)

0.11

 III

2.24(0.95–5.27)

0.07

1.19(0.99–1.43)

0.06

1.59(1.22–2.08)

 < 0.01

SURGERY

 Breast-conserving

reference

 

reference

 

reference

 

 Total mastectomy

0.67(0.31–1.43)

0.30

0.74(0.63–0.88)

 < 0.01

0.58(0.48–0.69)

 < 0.0001

 Modified radical mastectomy

0.26(0.08–0.85)

0.03

0.96(0.77–1.19)

0.70

0.63(0.50–0.80)

 < 0.01

RADIATION

 No

reference

   

reference

 

 Yes

0.32(0.15–0.70)

 < 0.01

0.72(0.59–0.88)

 < 0.0001

0.39(0.33–0.47)

 < 0.0001

CHEMOTHERAPY

 No

reference

 

reference

 

reference

 

 Yes

1.09(0.67–1.76)

0.73

0.44(0.38–0.51)

 < 0.0001

0.47(0.41–0.54)

 < 0.0001

SUBTYPE

 HoR + /HER2-

reference

 

reference

 

reference

 

 HoR + /HER2 + 

0.35(0.16–0.75)

0.01

1.32(1.05–1.68)

0.02

1.31(1.09–1.57)

 < 0.01

 HoR-/HER2 + 

0.70(0.35–1.38)

0.30

1.64(1.14–2.37)

0.01

1.41(1.06–1.86)

0.02

 HoR-/HER2-

0.55(0.27–1.13)

0.10

1.65(1.33–2.05)

 < 0.0001

1.83(1.57–2.14)

 < 0.0001

AGE (year)

 < 60

reference

 

reference

 

reference

 

 ≥ 60

3.22(1.95–5.31)

 < 0.0001

3.72(3.17–4.36)

 < 0.0001

3.08(2.65–3.58)

 < 0.0001

  1. Abbreviations: HR hazard ratio, HoR hormone receptor, HER‐2 human epidermal growth factor receptor‐2