Each year, millions of women are invited to participate in organized breast cancer screening. However, a significant proportion declines this first invitation. This apparently harmless choice could have lasting consequences on survival. A study by Karolinska Institutet in Sweden, published on September 24, 2025 in British Medical Journal (BMJ) highlights the risks linked to the absence of participation in the first mammography.
Of nearly 433,000 women followed for 25 years, the results show that those who ignore this first meeting present a risk of death by 40 %upper breast. These data, based on Swedish national registers, reveal that this initial behavior strongly determines the rest of the medical journey. This discovery raises an essential question of public health. How to avoid that this first failed meeting becomes an avoidable risk trajectory?
an initial behavior revealing a lasting risk
The study therefore demonstrates that absence at the first mammography is not an isolated event, but a strong behavioral indicator. We learn that 32.1 % of women invited to their very first screening did not participate. This initial refusal is accompanied by less participation in the following exams. On average, the researchers are 4.77 out of 10 screenings made for non-scouts, compared to 8.74 for those who have honored the first appointment.
The participation data show strong behavioral inertia. In figures: women absent in the first screening were seven times more likely to miss the second and three times more for the tenth. This reveals a persistent disengagement profile with regard to preventive medical follow-up. The authors insist on this risk trajectory, that health systems can however detect very early.
This behavior is not linked to an increase in the biological risk of developing breast cancer. He associates with a lack of membership in the organized prevention system, explain the authors at Guardian . The stake then becomes organizational: identifying these profiles from the first invitation to prevent them from becoming statistically invisible. This is an identifiable rocking point, which can be used to strengthen public health policies. But above all prevent, upstream, trajectories leading to a late diagnosis and reduced survival.
a clear correlation between non-participation and advanced stages of cancer
The concrete consequences of the refusal of the first screening appear in the characteristics of detected cancers. The study shows that women who have not participated in their first screening are much more likely to be diagnosed at an advanced stage. This in fact severely compromises their prognosis.
Among women who have developed breast cancer, the proportion of stages III and IV is significantly higher in non-participant. The data reveal a probability 1.53 times higher to have stage III cancer, and 3.61 times higher for a stage IV, compared to detected women. These are the stadiums where the tumor was spread locally (stadium III), that is metastasée (stadium IV). This makes treatments heavier and the chances of survival much lower.
The proportion of cancers detected by symptoms after missed screening was 3.7 times higher in non-participant. This data confirms a later diagnosis. It limits therapeutic options such as conservative surgery or early targeted treatments.
On the other hand, the overall prevalence of cancer remains comparable between the two groups (7.8 % for the participants, 7.6 % for the others). This eliminates the hypothesis from an increased predisposition to the disease in women absent from screening. The study therefore only questions the detection time. The identification of these cancers at an advanced stage has a direct impact on survival rates. According to the authors, this phenomenon results from a vicious circle. The absence of the first screening leads to irregular monitoring, promoting late diagnostics and the most severe forms of the disease.
measured exhaustion over 25 years and scientifically explained
The most alarming impact highlighted by the study lies in the lasting excess on the absence of the first screening. Over a period of 25 years, women who did not participate in their first mammography present a mortality by breast cancer of 9.9 per 1,000, against 7.0 per 1,000 in detected women. Or an excess of 40 % death.
The researchers dismissed the hypothesis of a simple selection bias, also comparing mortality unrelated to breast cancer. This is certainly a little higher among the non-participants. But it is significantly lower than the specific excess mortality linked to breast cancer. This confirms that the link is causal and specific, not the result of a globally degraded state of health.
The robustness of these results has been validated by several sensitivity analyzes. Even after exclusion of women with family history of cancer or diagnosis close to the date of screening, the mortality differences remained significant. The phenomenon is therefore stable, persistent and statistically solid.
This link between absence from the first screening and long -term death is based on an identifiable factor from the start, which makes it a powerful predictive indicator. Unlike genetic or biological factors that are difficult to detect in the general population, the participation history is immediately accessible. It becomes a priority prevention target according to the researchers.
to a overhaul of targeted and proactive screening strategies
The conclusions of the Swedish study raise a major question for public health systems. How to react effectively to early non-participation in organized screening? The data shows that it is not enough to invite. Indeed, the way in which the invitation is formulated and followed just as much.
currently, in many countries such as France or the United Kingdom, the invitations are passive. A letter is sent, without real follow -up of the absent. However, the study shows that this institutional laissez can contribute to mortality. The challenge becomes to act from the first absence, by proposing for example a second automatic meeting, personalized reminders, or telephone contact.
previous randomized studies have shown that simple interventions-such as a recovery call or sending a targeted SMS-can increase the participation rate by 10 to 25 %. This could change the trajectory of tens of thousands of women, according to the projections of the authors.
Professor Kamila Czene underlines, in a < href = "https://medicalxpress.com/News/2025-09-women-mammogram-higher-breast-cancer.html?utm_source=rss_feed& ;utm_medium=Link& Rel = "Noopener"> Communiqué , that the challenge is not to feel guilty. Modifiable behavioral risk profiles must be identified. She recalls that “ This risk factor is as powerful as certain family history, but it is entirely avoidable “. The system can therefore act without resorting to new expensive tests, only from data already available.
adopt a systematic recall policy from the first refusal, even psychosocial support in certain disadvantaged areas, would not only increase participation, but above all to save long -term lives. An orientation which, according to the authors, should become a priority in future national screening strategies.
Source: Ma Z., et al., “ and breast cancer incidence and mortality in the subsequent 25 years: population based cohort study ”. BMJ, 2025. 390: E085029 DOI: 10.1136/BMJ-2025-085029
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