Table 2 Breast cancer risk in women stratified by site of first primary cancer diagnosed before BCa-2 in their FDRs

Stomach ^c

6

3.92

1.76

8.72

Small intestine

2

1.61

0.40

6.42

CRC

44

1.60

1.19

2.15

Liver

3

2.10

0.68

6.52

Lung ^c

5

1.00

0.42

2.40

Cervix ^c

16

1.46

0.89

2.38

Endometrium

60

2.07

1.60

2.67

Ovary

24

2.82

1.89

4.21

Female genital

2

0.79

0.20

3.17

Prostate

3

2.58

0.83

7.99

Kidney ^c

10

1.44

0.77

2.68

Bladder ^c

8

1.00

0.50

2.00

Melanoma

21

1.33

0.87

2.04

Skin

11

1.11

0.61

2.01

Nervous system

18

1.94

1.22

3.07

Thyroid

10

1.54

0.83

2.86

Endocrine gland

20

2.05

1.32

3.18

Bone

1

0.80

0.11

5.69

Connective tissue

4

1.89

0.71

5.05

NHL ^d

12

2.84

1.61

5.00

Hodgkin lymphoma ^d

3

2.06

0.67

6.40

Myeloma ^d

1

1.59

0.22

11.29

Leukemia ^d

4

0.85

0.32

2.26

CUP

5

2.24

0.93

5.38

Smoking related cancers

50

1.34

1.02

1.77

Hematological cancers

20

1.82

1.17

2.81

Any cancer other than BC

298

1.68

1.49

1.88