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Table 1 Summary of all women diagnosed with in situ breast cancer from 1980 to 2004

From: The impact of in situ breast cancer and family history on risk of subsequent breast cancer events and mortality - a population-based study from Sweden

  All No family history Family history
Total 8111 7252 859
Mean age at first in situ breast cancer (SD) 59.1 (12.1) 59.7 (12.1) 53.9 (10.8)
Mean follow-up time, years (SD) 8.8 (5.9) 8.3 (5.9) 7.7 (5.4)
Year at diagnosis of first in situ cancer
 1980 − 1984 665 624 41
 1985 − 1989 1211 1108 103
 1990 − 1994 2046 1835 211
 1995 − 1999 1963 1727 236
 2000 − 2004 2226 1958 268
Age at diagnosis of first in situ cancer, years
  < 40 335 269 66
 40–44 594 507 87
 45–49 1078 903 175
 50–54 1313 1133 180
 55–59 1133 993 140
 60–64 1021 943 78
 65–69 1058 995 63
 70–74 778 748 30
 75+ 801 761 40
Type of second events
 Contralateral in situ 118 104 14
 Ipsilateral invasive 376 334 42
 Contralateral invasive 303 262 41
 Total invasivea 768 677 91
 Second breast event totala,b 886 781 105
Type of second events (women, n)
 Contralateral in situ a 117 103 14
 Ipsilateral invasive 370 328 42
 Contralateral invasive 299 258 41
 Total invasivea 725 637 88
 Second breast event totala,b 825 728 97
  1. aIncludes the events where laterality is missing. 2bipsilateral in situ events were not included in the study