Thank you, dear committee members, for the opportunity to testify today on this critical issue.
I am a breast imaging specialist at the Ottawa Hospital, where I diagnose women at every stage of breast cancer. Early detection is key. Screening detects cancers at stages 0 and 1, while cancers detected once symptoms appear are often advanced—stages 2, 3 or even 4—requiring aggressive, life-altering treatments. Seventeen per cent of breast cancers occur in women in their forties. These are often aggressive, fuelled by ovarian hormones, and there is minimal overdiagnosis in this age group. Without screening, these cancers will continue to grow unchecked. Breast cancer is the leading cause of death for Canadian women aged 40 to 55.
I was invited as an expert to work with the Ottawa panel reviewing the evidence for the breast screening guideline update. What I witnessed was deeply concerning. The task force ignored recent, robust evidence that supports lowering the age for screening to 40, evidence that the U.S. task force and numerous other countries have already embraced.
I've had the privilege of collaborating with Statistics Canada and other Canadian researchers on multiple studies. The research is clear and points to the same conclusion: The age for screening in Canada must be lowered. Our research with Statistics Canada showed a dramatic increase in breast cancer incidence over the past 35 years, with a significant 9.1% rise in women in their forties.
Last month, we published a study—again with Statistics Canada—highlighting that younger women, particularly those aged 40 to 45, are more likely to be diagnosed with aggressive breast cancer subtypes. These cancers, like triple negative breast cancer, have a poorer prognosis when detected late, with only 47% of women surviving five years after being diagnosed with stage 3 disease. However, our study also revealed hope. Early detection can play a pivotal role in improving survival outcomes. Across all subtypes, when cancer is detected at stage 1, the five-year survival rate is greater than 96%.
Any argument that stage doesn't matter because we have good treatments today is very misleading. In Canada, the five-year survival rate for stage 1 breast cancer is nearly 100%, but it plummets to a devastating 23% when the disease is stage 4.
In another study, we analyzed provinces with screening programs for women in their forties, like Yukon, P.E.I., Nova Scotia and British Columbia, and we found a significant reduction in stage 4 cancers among those in their forties simply because they lived in a province that screened women at 40. Women in these provinces are diagnosed at earlier stages, saving lives and reducing suffering. This applies not only to women in their forties but also to women in their fifties whose cancers are caught earlier thanks to screening in their forties.
Another of our studies showed that screening in the forties was associated with a marked improvement in 10-year net survival and a reduction in breast cancer mortality. This isn't just about saving lives; it's also about reducing the massive financial burden of treating advanced cancer. In 2023, we published research showing that in Canada, the cost of treating a stage 1 breast cancer diagnosis is under $40,000. However, for stage 4, that cost skyrockets to an average of $370,000 due to expensive treatments like chemotherapy and immunotherapy.
In addition, we looked at cost effectiveness in Canada. We found that screening women every two years from ages 40 to 74 is not only life-saving but also cost-effective compared to screening from ages 50 to 74. Screening every year is even more cost-effective, saving $31,000 per death averted and $1,889 per life year saved. It's estimated to save over $417 million Canadian every year, which is a huge benefit in terms of cost effectiveness.
One thing that some people fear is that increased screening will increase the number of cancers and therefore increase costs. However, our research found the opposite. When we compared provinces that screen women in their forties to those that don't, we found no increase in breast cancer incidence. This is because if you don't screen in the forties, the cancers don't disappear. They keep growing and are eventually diagnosed at later, more dangerous stages.
Lastly, I'd like to emphasize the profound disparities that exist in breast cancer diagnosis across race and ethnicity in Canada.
In our study with Statistics Canada, which was recently accepted for publication, we found that while the peak age of diagnosis for white women is in their sixties, non-white women are far more likely to be diagnosed in their forties. We found that 41% of cancers in non-white women are diagnosed before age 50, compared to just 16% for white women.
Also, Black women are 1.4 times more likely to die from breast cancer. These women often develop aggressive subtypes of the disease, but even these aggressive cancers can be treated effectively when caught early. Screening at age 40 isn't just a matter of science; it's a matter of equity.
We cannot allow outdated guidelines to persist when the evidence is clear, overwhelming and urgent. We must demand that our health policies reflect the latest scientific evidence and best practices. We must act now in Canada. Many lives depend on it.
Thank you very much.