Require breast density reporting, and provide alternative imaging and screening

What the Topic Is

This petition asks the New Zealand Government to change how breast cancer screening works for women with "dense" breast tissue. Breast density refers to the amount of fibrous and glandular tissue in the breast compared to fatty tissue. On a mammogram (a breast X-ray), both dense tissue and cancer appear white. This makes it harder for doctors to spot tumors in dense breasts. The petition requests that breast density be measured and reported to all women during screening, and that those with high density receive extra tests, such as contrast-enhanced mammography, which uses a dye to make tumors stand out more clearly.

Current Situation in New Zealand

New Zealand’s national breast cancer screening program is called BreastScreen Aotearoa. It offers free mammograms to women aged 50–69 every two years. Currently, while radiologists can see density, it is not systematically measured or reported to patients as a standard part of the screening result. This petition exists because advocates argue that women with dense breasts are at higher risk and that current screening methods may miss early-stage cancers in this group.

Arguments in Favour

• Higher Risk: Women with very dense breasts (Grade 4) have a 2–5 times higher risk of developing breast cancer compared to women with fatty breasts.
• Better Detection: Dense tissue masks cancer on standard mammograms. Supplemental imaging could detect cancers earlier, potentially improving survival rates.
• Informed Choice: Knowing your breast density allows women to make informed decisions about their health and seek further testing if needed.

Arguments Against

• Cost and Resources: Adding density reporting and supplemental scans for a subset of the population would increase costs for the public health system. It is unclear if the budget can support this without reducing services elsewhere.
• False Positives: More testing can lead to more "false alarms" (finding something that looks like cancer but isn’t), causing anxiety and unnecessary biopsies.
• Uncertain Benefit: Some medical experts argue that the evidence for supplemental screening in average-risk women is not yet strong enough to justify a nationwide mandate, preferring to focus resources on high-risk groups.

Relevant Context

Up to 10% of women have Grade 4 breast density, meaning at least 75% of their breast tissue is dense. In other countries, such as the United States, laws have been passed requiring doctors to tell patients if their breasts are dense. New Zealand does not currently have this requirement. The petition is directed at the House of Representatives, asking them to urge the Government to update BreastScreen Aotearoa’s protocols to include mandatory density reporting and access to alternative imaging every two years for affected women.

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