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BMJ. 2004 Apr 17;328(7445):921-4. Epub 2004 Mar 10.

Incidence of breast cancer in Norway and Sweden during introduction of nationwide screening: prospective cohort study.

Author information

1
Norwegian Institute of Public Health, PO Box 4404 Nydalen, N-0403 Oslo, Norway.

Abstract

OBJECTIVE:

To determine whether any increase in the incidence of breast cancer in women detected by mammography is compensated for by a drop in the incidence after age 69, years when women are no longer invited for screening.

DESIGN:

Population based cohort study of incidence of breast cancer during the introduction of nationwide screening programmes.

SETTING:

Norway and Sweden.

PARTICIPANTS:

All women aged above 30 years (1.4 and 2.9 million, respectively, in 2000).

MAIN OUTCOME MEASURES:

Changes in age specific incidence rates of invasive breast cancer associated with the introduction of the screening programmes.

RESULTS:

As a result of screening the recorded incidence of breast cancer in women aged 50-69 years increased by 54% in Norway and 45% in Sweden. There was no corresponding decline in incidence after the age of 69 years.

CONCLUSIONS:

Without screening one third of all invasive breast cancers in the age group 50-69 years would not have been detected in the patients' lifetime. This level of overdiagnosis is larger than previously reported.

PMID:
15013948
PMCID:
PMC390204
DOI:
10.1136/bmj.38044.666157.63
[Indexed for MEDLINE]
Free PMC Article
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