Table 3 Standardised incidence ratio (SIR) and absolute excess risk (AER) for second breast cancer and second other cancers after BCIS (breast carcinoma in situ), according to follow-up time

From: Increased risk of second malignancies after in situ breast carcinoma in a population-based registry

  

Second breast cancer

Other second cancers

Period of follow-up

PYR a

Obs b

Exp c

SIR

AER

Obs b

Exp c

SIR

AER

1–4 years

3596

33

9.7

3.4d

65

31

18.9

1.6d

34

5–9 years

1815

22

5.0

4.4d

94

12

10.1

1.2

11

⩾10 years

1127

6

3.3

1.8

24

9

7.4

1.2

14

  1. aPYR: person-years.
  2. bObs: observed numbers of second primary cancers.
  3. cExp: expected numbers of second primary cancers.
  4. d95% confidence interval excludes 1.
Back to article page