No RT (n = 1111)

RT (n = 1447)

Characteristic

HR

p

HR

p

Age

Continuous, per year

0.98

0.007

0.96

<0.0001

Family history

Yes vs No

1.31

0.08

1.28

0.2

Presentation

Clinical vs Radiologic

1.50

0.04

1.21

0.5

Nuclear grade

High vs Non-high

1.04

0.8

1.02

0.9

Necrosis

Present vs Absent

1.54

0.01

1.10

0.7

No. of excisions

≥3 vs ≤2

2.11

0.009

1.18

0.5

Margin status

Negative vs Positive/Close

0.58

0.001

Endocrine Treatment

Yes vs No

0.57

0.02

0.45

0.002

Time period

1999-2010 vs 1978-1998

0.62

0.003

1.13

0.62