Overdiagnosis in screening mammography in Denmark: population based cohort study.

ABSTRACT:

Objective

To use data from two longstanding, population based screening programmes to study overdiagnosis in screening mammography.

Design

Population based cohort study.

Setting

Copenhagen municipality (from 1991) and Funen County (from 1993), Denmark.

Participants

57,763 women targeted by organised screening, aged 56-69 when the screening programmes started, and followed up to 2009.

Main outcome measures

Overdiagnosis of breast cancer in women targeted by screening, assessed by relative risks compared with historical control groups from screening regions, national control groups from non-screening regions, and historical national control groups.

Results

In total, 3279 invasive breast carcinomas and ductal carcinomas in situ occurred. The start of

SUBMITTER: Njor SH 

PROVIDER: S-EPMC3582341 | biostudies-literature | 2013 Feb

REPOSITORIES: biostudies-literature