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

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

	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 invasive^a	768	677	91
Second breast event total^a,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 invasive^a	725	637	88
Second breast event total^a,b	825	728	97

^aIncludes the events where laterality is missing. ^2bipsilateral in situ events were not included in the study

ISSN: 1465-542X