Table 2 Comparison of characteristics of breast cancer among patients aged 50–69 years between organised and opportunistic mammography screening. Fribourg cancer registry 2006–2014

 In situ

72

(18.0)

22

(10.7)

1

[1.09; 3.02]

0.022

 Invasive

330

(82.1)

183

(89.3)

1.8

  ≤ 20 mm

253

(77.8)

145

(80.6)

1

[0.54; 1.33]

0.476

  > 20 mm

72

(22.2)

35

(19.4)

0.8

 T1mic-T1a

33

(10.2)

26

(14.4)

1

[0.36; 1.19]

0.518

 T1b

85

(26.2)

45

(25.0)

0.7

[0.39; 1.25]

 T1c

135

(41.5)

74

(41.1)

0.7

[0.32; 1.19]

 T2-T3

72

(22.2)

35

(19.4)

0.6

 N0

252

(77.1)

134

(75.3)

1

[0.72; 1.69]

0.652

 N+

75

(22.9)

44

(24.7)

1.1

 M0

326

(98.8)

176

(97.8)

1

[0.46; 7.50]

0.387

 M1

4

(1.2)

4

(2.2)

1.9

 Ductal, NST

245

(74.2)

133

(72.7)

1

[0.32; 1.72]

0.543

 Ductal, others

20

(6.1)

8

(4.4)

0.7

[0.60; 1.77]

 Lobular

43

(13.0)

24

(13.1)

1.0

[0.78; 2.91]

 Mixed

22

(6.7)

18

(9.8)

1.5

 Luminal A

160

(53.5)

83

(53.5)

1

0.440

 Luminal B, HER2-

75

(25.1)

36

(23.2)

0.9

[0.57; 1.49]

 Luminal B, HER2+

20

(6.7)

8

(5.2)

0.8

[0.33; 1.83]

 HER2+, non-luminal

11

(3.7)

12

(7.7)

2.1

[0.89; 8.97]

 Triple negative

33

(11.0)

16

(10.3)

0.9

[0.49; 1.80]

 ER+/PR+

259

(78.5)

143

(78.5)

1

[0.40; 1.64]

0.693

 ER+/PR-

27

(8.2)

12

(6.6)

0.8

[0.69; 1.93]

 ER−/PR-

44

(13.3)

28

(15.3)

1.2

  < 15%

172

(59.1)

92

(62.2)

1

[0.59; 1.32]

0.537

  ≥ 15%

119

(40.9)

56

(37.8)

0.9

 Positive

31

(9.5)

20

(11.0)

1

[0.47; 1.54]

0.595

 Negative

295

(90.5)

162

(89.0)

0.9