Women who skip their first mammogram screening face a significantly higher long-term risk of dying from breast cancer, according to new research published in The BMJ. The findings highlight how one early decision can set a lasting pattern that influences health outcomes decades later.
Why the First Screening Matters
The study followed more than 430,000 women for up to 25 years. It found that those who declined their initial screening were far more likely to miss future mammograms, leading to later diagnoses and poorer prognoses. Women who missed their first mammogram were 1.5 times more likely to be diagnosed with stage III breast cancer and 3.6 times more likely to be diagnosed at stage IV compared with women who attended.
Over the course of the study, nearly 1% of women who skipped their first mammogram died of breast cancer, compared with 0.7% of those who participated — a difference equating to a 40% higher risk of death. Importantly, the overall number of women who developed breast cancer was the same in both groups. The difference came down to when the cancer was detected.
“This shows the increased mortality is mainly due to delayed detection rather than more cases of the disease,” the researchers concluded.
Broader Lessons for Screening
Although the study was based on data from Sweden, health experts say the message is universal: early and consistent screening saves lives.
In the U.S., breast cancer is the second most common cancer among women and the second leading cause of cancer death. More than 279,000 women were diagnosed in 2022, and more than 42,000 died in 2023, according to the Centers for Disease Control and Prevention.
The U.S. Preventive Services Task Force now recommends that women at average risk begin mammograms at age 40 and continue every other year until age 74. Women at higher risk — such as those with a family history or certain genetic mutations — may need to start earlier and be screened more frequently.
Black Women Face Higher Mortality
The urgency is even greater for Black women, who are less likely to be diagnosed with breast cancer but more likely to die from it. Studies show Black women are about 40% more likely to die from breast cancer than white women. Later diagnoses, barriers to care, and more aggressive tumor types contribute to this disparity.
These sobering statistics underscore the importance of not delaying that very first mammogram — especially in communities where outcomes are already worse.
Beyond Mammograms
Mammograms remain the gold standard for early detection, but women should also be aware of additional tools. For those with dense breast tissue or higher genetic risk, providers may recommend ultrasounds, MRIs, or genetic testing.
Breast self-awareness also matters. While routine self-exams are not a substitute for screening, women should know what is normal for their bodies and promptly report changes such as lumps, nipple discharge, or skin changes.
Reducing Risk
Prevention is also part of the equation. Maintaining a healthy weight, limiting alcohol, exercising regularly, and not smoking can reduce breast cancer risk.
A Timely Reminder
This article is the second in our weekly series for Breast Cancer Awareness Month. Each October, awareness campaigns remind women of the importance of early detection. The new study reinforces that message: making the choice to attend the first mammogram can be a lifesaving investment in the future.