Nationwide breast cancer screening programme fully implemented in The Netherlands

Area of Science:

• Oncology
• Public Health
• Radiology

Background:

• The Netherlands implemented a nationwide breast cancer screening program from 1990-1997.
• The program offers biennial mammography to women aged 50-69 years (currently 50-75).

Purpose of the Study:

• To evaluate the outcomes of the nationwide breast cancer screening program in the Netherlands.
• To assess screening effectiveness, including detection rates and interval cancers.

Main Methods:

• Annual monitoring of screening outcomes by the National Evaluation Team.
• Utilizing regional cancer registries and linkage with screening data to identify interval and unscreened cancers.
• Analysis of data from approximately 4 million invited women.

Main Results:

• An attendance rate of 78.5% was observed.
• Initial screening detected 6.1 breast cancers per 1000 women, with lower rates in subsequent screens.
• 0.95 interval cancers per 1000 women-years were diagnosed within two years post-screening.
• Screen-detected cancers showed a more favorable stage distribution compared to interval or unscreened cancers.

Conclusions:

• The breast cancer screening program in the Netherlands yields largely expected and positive results.
• Screening contributes to detecting cancers at earlier stages.
• Opportunities exist to enhance the program, particularly by improving cancer detection rates in subsequent screening rounds.