Participation In Breast Cancer Screening Research Articles

Advancing mammography uptake among vulnerable groups: a systematic review of intervention strategies

Abstract With over 2 million cases diagnosed annually, breast cancer is a leading cause of cancer-related disability and mortality. Despite global efforts to implement mammography screening programs, uptake rates vary widely across settings due to socioeconomic factors and accessibility challenges. To improve participation, targeted interventions addressing barriers faced by underserved groups are essential for promoting inclusive screening and early detection. As part of the ENTER project, which aims to address disparities in breast cancer screening participation among women with low socioeconomic status (SES) in Flanders, Belgium, we conducted a systematic review and meta-analysis on the effectiveness of interventions to enhance mammography uptake. To explore the differential impact of interventions on mammography uptake among vulnerable groups, including individuals with low SES, underinsured, with immigrant background or part of an ethnic minority, subgroup analyses were performed. 7 databases were searched, resulting in the inclusion of 54 out of 9,366 papers for analysis. 14 types of interventions were identified. The meta-analysis showed significant pooled effects of interventions that increased mammography uptake [OR 1.8 (95%CI 1.6-2.2)], particularly among vulnerable populations [OR 2.2 (95%CI 1.7-2.8)]. The most effective interventions were educational interventions [OR 3.03 (95%CI 2.2-4.9); in vulnerable groups OR 2.7 (95%CI 1.9-3.9)]. As expected, interventions adapted to linguistic needs and culturally sensitive approaches showed a significant effect among vulnerable target groups [OR 2.9 (95%CI 1.1-7.9) and OR 2.5 (95%CI 1.1-5.6), respectively]. Reminders were also highly effective [OR 1.8 (95%CI 1.5-2.1); in vulnerable groups OR 2.5 (95%CI 1.9-3.1)]. This review underscores the critical role of targeted interventions in augmenting screening mammography uptake, particularly among vulnerable populations, where odds of participation can increase by up to 2-3 times. Key messages • Interventions adapted to the linguistic needs of the target population and culturally sensitive approaches, aligned with values and beliefs of a specific community, can greatly enhance screening rates. • Considering costs, practicality and impact, reminder letters with culturally and linguistically adapted content emerged as the most promising option for implementation in the ENTER project.

Physical activity, screening cancer, and savings rate as indicators of health responsibility

Introduction: The health of individuals can change gradually over time as a result of the choices they make. Aim: The study aimed to examine indicators such as physical activity levels, screening participation, and household savings in the context of their role as potential measures of individual health responsibility. The second aim was to identify cognitive barriers and motivations influencing physical activity, breast and cervical cancer screening participation, and money-saving habits. Material and methods: The analysis used available data on physical activity, the screening level (for breast and cervical cancer), and household savings rates. Then, the data for Poland were presented against the background of available averages for the European Union. The data came from Eurostat, Eurobarometer - the official survey instrument used by the European Parliament. Results: According to Eurobarometer data, 65% of respondents in Poland have never been physically active in 2022 (vs in the European Union 45%). In 2022, the percentage of women who were screened for cervical cancer in Poland was 34% of women. And the cervical cancer program (cytology) was used by 10.9% of people. In 2022, the household saving rate was 12.7 % in the EU, and in Poland -2.89%, where the lowest rate occurred in Greece and the highest in Germany (Eurostat data). Conclusion: The low level of physical activity and participation in screening tests in Poland, compared to EU countries, highlights the need to intensify public health promotion activities. Additionally, promoting saving as an important element of health responsibility can not only improve the financial well-being of citizens but also have a positive impact on their mental health.

1564P Limited participation in breast cancer screening among low-SES women: A matter of engagement or of health literacy?

1564P Limited participation in breast cancer screening among low-SES women: A matter of engagement or of health literacy?

The mediating effect of self-efficacy on social support and cancer screening behavior among Chinese women: a cross-sectional study

BackgroundBreast and cervical cancer are the most common cancers in women, and are associated with high morbidity and mortality rates. Cancer screening can facilitate early diagnosis, reduce mortality, and ease the burden of cancer. Social support and self-efficacy are strongly associated with cancer screening behavior. The present study aimed to explore the mediating effect of self-efficacy on social support and cancer screening behavior.MethodsIn this cross-sectional survey study conducted from June to October 2023, 312 women aged 35–65 years were recruited from the East Coast area of China. A general information questionnaire, cancer screening behavior questionnaire, social support scale and self-efficacy scale were used to collect data. Descriptive statistics were used to analyze the general characteristics of participants; one-way analysis of variance was used to test for differences in the measured variables; and Pearson’s correlation analyses were used to describe the relationship among social support, self-efficacy, and cancer screening behavior. A mediation model was constructed and analyzed using the PROCESS macro for SPSS.ResultsThe mean (standard deviation) screening behavior score for breast cancer and cervical cancer was 3.98 (2.79), representing an intermediate level. Self-efficacy was closely related to social support and cancer screening behavior. Social support showed a significant positive correlation with self-efficacy (r = 0.37, p < 0.01) and cancer screening behavior (r = 0.18, p < 0.01). Self-efficacy was also significantly positively correlated with cancer screening behavior (r = 0.19, p < 0.05). Self-efficacy showed a full mediating effect between social support and cancer screening behavior, with an explanatory power of 32%.ConclusionsThe findings emphasize the need to increase women’s level of social support and self-efficacy, which in turn can increase women’s participation in breast and cervical cancer screening.

Linguistic difference in the effect of organized programs on socioeconomic inequalities in breast cancer screening: ecological study in Switzerland.

The objective of this study is to examine how the effect of organized mammography screening programs on breast cancer screening participation differ between socioeconomic strata and how this relationship may be modified by the context of linguistic differences. Switzerland, marked by its diverse linguistic landscape, reflects cultural variations alongside differences in public health strategies. The goal of this study was to assess potential socioeconomic differences in regional mammography screening programs effectiveness to improve breast cancer screening participation. Data on 14 173 women in the regionally adapted breast cancer screening age range was drawn from five cross-sectional waves of the nationally representative Swiss Health Interview Survey (1997-2017). Socioeconomic indicators included education, household income, and employment status. Poisson regression was used to estimate the adjusted prevalence ratios of up-to-date (last 2 years) mammography uptake. Inequality was assessed using relative index of inequality and the slope index of inequality. Organized screening programs were generally effective and increased up-to-date mammography uptake by close to 20 percentage points in both regions. While in the Latin cantons, screening programs had no impact on socioeconomic inequalities in screening, it reduced inequalities for women with lower education in the German cantons. This modification effect of screening programs was not seen for income and employment-related inequalities and did not differ across linguistic regions. Public health agencies should consider the different cultural reception of programs as addressing these differences could help ensure that breast cancer screening initiatives are not only effective, but also culturally equitable across different socioeconomic groups.

Development of neighborhood networks in suburban areas for persuading women to adhere to breast cancer screening programs

Introduction: The purpose of this study was to determine the effectiveness of the development of neighborhood networks in suburban areas for increasing adherence to breast cancer screening. Methods: This community-based intervention study was conducted among Iranian urban women aged 30 to 65 in 2021. The samples were chosen using a multi-stage random sampling process. Women were randomly assigned to intervention group (n=271) and control group (n=155). Following a three-month intervention period, participants were asked about their breast cancer screening behaviors to gauge the program’s success. Cognitive factors including perceived social support, perceived benefits and perceived barriers toward breast cancer screening, subjective norms, behavioral intention, and breast cancer screening behaviors were collected. The data were analyzed with SPSS statistical software version 21. Results: After the intervention, the results showed an improvement in the intention of referring to mammography centers, perceived benefits of early diagnosis of breast cancer, receiving social support, breast cancer screening behaviors, and a decrease in barriers to early diagnosis of breast cancer compared to the control group (P&lt;0.05). Conclusion: Harnessing the power of social networks alongside educational initiatives and strong community support can provide a safe, affordable, and effective means of boosting participation in Breast Cancer Screening (BCS).

Contextual and individual inequalities in breast cancer screening participation and outcomes in Turin (North-West Italy)

Breast cancer incidence and screening participation exhibit an unequal distribution in the population. This study aims to investigate the impact of socioeconomic position (SEP) on three breast screening indicators (participation, recall, and cancer detection rates) among women aged 50–69 in the city of Turin between 2010 and 2019. The study also aims to determine whether contextual factors (deprivation index) or individual factors (educational level) have a greater influence. The data used in this study are sourced from the Turin Breast Screening Program (TBSP) and the Turin Longitudinal Study (TLS). To test the hypothesis and account for the hierarchical structure of the data, multilevel models were used. Both contextual and individual SEP were found to be associated with screening participation. Participation increased with higher levels of deprivation (odds ratio for most deprived: 1.13; 95% CI 1.11–1.16) and decreased with higher educational levels (OR for low educated: 1.37; 95% CI 1.34–1.40). Contextual SEP did not show any association with recall or cancer detection rates, but individual SEP had an impact. Women with lower educational levels had a statistically significant 19% lower odds of being recalled and a statistically significant 20% lower odds of being diagnosed with cancer. Additionally, immigrant women were less likely to participate in screening, be recalled, or receive a cancer diagnosis. Educational level consistently influenced the analyzed screening indicators, while contextual deprivation appeared to have less importance. It is likely that women living in less deprived areas and with higher education have greater access to opportunistic screening.

Expansion of outreach to native Hawaii and Pacific Islander communities to increase breast cancer screening and clinical trial awareness in underserved and rural Oahu.

e13725 Background: Multiple barriers exist in the enrollment of racial and ethnic minority groups into breast cancer screening and clinical trials. Such barriers include the lack of knowledge, mistrust, and access. To increase participation of rural-dwelling Native Hawaiian/Pacific Islanders (NHPI) and other underserved minority groups in breast cancer screening and clinical trials, a pilot project was developed to augment community engagement, provide education, and gain insights into the cancer screening/clinical trial process. Our objective was to engage rural Oahu's underserved communities in breast cancer screening and facilitate enrollment into the Digital Tomosynthesis Mammography and Digital Mammography in Screening Patients of Breast Cancer Trial (TMIST) utilizing a team comprising of a cultural congruent and gender concordant Community Health Educator (CHE) and medical oncology health care provider. Methods: We reviewed the community activities over the course of a year. The CHE facilitated outreach by speaking at numerous church events and other community gatherings. Results: Participants did not respond favorably to surveys on social determinants of health. Common reasons for their reluctance included lack of perceived importance and medical mistrust. When discussing verbiage that was intimidating or confusing such as clinical trial protocol consent language, TMIST study participants conveyed a strong sense of dehumanization. Conclusions: A total of 93 women were screened for the TMIST clinical trial. Of those, 13 were enrolled in TMIST and 31 participants received mammograms. Participant insight highlighted the importance of education using culturally sensitive language and community engagement to combat the lack of knowledge and mistrust. Continued development of education materials centered around community involvement will improve the accrual of NHPI participation in breast cancer screening/clinical trials. We hope this project established a basis for equity in communities with low breast cancer screening and clinical trial participation rates. We intend to build upon the community partnerships forged during this pilot project.

Random effects models of tumour growth for investigating interval breast cancer.

In Nordic countries and across Europe, breast cancer screening participation is high. However, a significant number of breast cancer cases are still diagnosed due to symptoms between screening rounds, termed "interval cancers". Radiologists use the interval cancer proportion as a proxy for the screening false negative rate (ie, 1-sensitivity). Our objective is to enhance our understanding of interval cancers by applying continuous tumour growth models to data from a study involving incident invasive breast cancer cases. Building upon previous findings regarding stationary distributions of tumour size and growth rate distributions in non-screened populations, we develop an analytical expression for the proportion of interval breast cancer cases among regularly screened women. Our approach avoids relying on estimated background cancer rates. We make specific parametric assumptions concerning tumour growth and detection processes (screening or symptoms), but our framework easily accommodates alternative assumptions. We also show how our developed analytical expression for the proportion of interval breast cancers within a screened population can be incorporated into an approach for fitting tumour growth models to incident case data. We fit a model on 3493 cases diagnosed in Sweden between 2001 and 2008. Our methodology allows us to estimate the distribution of tumour sizes at the most recent screening for interval cancers. Importantly, we find that our model-based expected incidence of interval breast cancers aligns closely with observed patterns in our study and in a large Nordic screening cohort. Finally, we evaluate the association between screening interval length and the interval cancer proportion. Our analytical expression represents a useful tool for gaining insights into the performance of population-based breast cancer screening programs.

Would shared decision-making be useful in breast cancer screening programmes? A qualitative study using focus group discussions to gather evidence from French women with different socioeconomic backgrounds

BackgroundTo inform the development of an online tool to be potentially used in shared decision-making about breast cancer screening, French women were questioned about participation in breast cancer screening, the health professional’s role, and their perceptions of the proposed tool.MethodsWe organised focus group discussions with 55 French women. Two different strategies were used to recruit women from high and low socioeconomic backgrounds. We applied both inductive and deductive approaches to conduct a thematic analysis of the discussions. We analysed the responses by using the main determinants from different health behaviour models and compared the two groups.ResultsIndependently of socioeconomic status, the most important determinant for a woman’s participation in breast cancer screening was the perceived severity of breast cancer and the perceived benefits of its early detection by screening. Cues to action reported by both groups were invitation letters; recommendations by health professionals, or group/community activities and public events were reported by women from high and low socioeconomic backgrounds, respectively. Among other positive determinants, women from high socioeconomic backgrounds reported making informed decisions and receiving peer support whereas women from low socioeconomic backgrounds reported community empowerment through group/community events. Fear of cancer was reported as a barrier in both groups. Among other barriers, language issues were reported only by women from low socioeconomic backgrounds; women from high socioeconomic backgrounds reported breast cancer screening-related risks other than overdiagnosis and/or overtreatment. Barriers to accessing the online tool to be developed were mainly reported by women from high socioeconomic backgrounds.ConclusionLimitations in implementing shared decision-making for women from low socioeconomic backgrounds were highlighted. An online tool that is suitable for all women, regardless of socioeconomic status, would provide “on-demand” reliable and tailored information about breast cancer screening and improve access to health professionals and social exchanges.

Conceptualization of Breast Cancer and Attitudes toward Breast Cancer Screening: A Qualitative Study on Iranian and Australian Women

Objective Regular screening can lead to early diagnosis of breast cancer. Australia is one of the countries with a high rate of participation in breast cancer screening, while in Iran, most patients are diagnosed in advanced stages. This qualitative study used a thematic analysis method to examine the attitudes and beliefs of Iranian and Australian women toward breast cancer and breast cancer screening. Method In-depth interviews were conducted with eight Iranian and seven Australian women. Data were collected through semi-structured interviews and analyzed using thematic analysis with an inferential approach. Results According to the results, four main themes were extracted for the perceptions of breast cancer, including “the meaning of breast cancer”, “causes of breast cancer”, “prevention of breast cancer” and “effects of significant people in life”. Considering the perceptions of breast cancer screening, three themes were identified, including “beliefs about breast cancer screening,” “sources of information about breast cancer screening,” and “barriers to breast cancer screening.” Conclusion Cultural and social factors influence women’s perceptions of breast cancer and screening. Therefore, investigating the cultural meaning of breast cancer and breast cancer screening for women can be useful for screening and prevention purposes.

BREAST CANCER SCREENING IN ROMANIA: CHALLENGES AND OPPORTUNITIES FOR EARLY DETECTION.

Breast cancer has surpassed lung cancer as the most common type of cancer globally, representing approximately 25% of all cancer cases and leading in cancer-related mortality among women. In Romania, breast cancer accounts for 26.9% of all female cancer diagnoses, with an increasing incidence and significant mortality rate despite one of the lowest incidence rates in Europe. The study highlights the disparities in breast cancer outcomes across Europe, with Romania showing lower survival rates compared to Western European countries. This disparity is partly attributed to the low participation in breast cancer screening programs, where only 9% of eligible Romanian women underwent mammography in 2020, far below the European average of 60%. The World Health Organization (WHO) and European Commission emphasize the importance of organized population-based screening for women aged 50-69, yet many barriers, including low health literacy, lack of awareness, and socio-economic challenges, hinder effective participation, especially among vulnerable populations. This study, conducted over three years at the "Alessandrescu Rusescu " National Institute for Mother and Child Health, involved 1,705 patients and aims to provide insights into improving breast cancer screening participation and outcomes in Romania.

Exploring Disparities in Breast Cancer Screening: An Ecological Analysis of Australian Data.

The objective of this study is to analyse the socio-spatial patterns of breast cancer screening across Australian regions. The research is an ecological study. Data for breast screening participation and associated social and demographic factors are obtained from the Australian Institute of Health and Welfare and the Australian Bureau of Statistics. The unit of measurement for the analysis is spatially aggregated regions (Statistical Area 3). Geographically weighted regression is used to analyse the relationship between a dependent variable and one or more independent variables while considering the spatial or geographic relationships among the data points. Globally, there was a significant (p<0.05) association between screening participation and income, English ability, education level, Indigenous background, and transport availability. The geographically weighted regression model represented an improved fit with a higher R2 (R2=0.89) and the Akaike information criterion (AIC) has improved, (AIC= 391.92). The Monte-Carlo tests for spatial variability were significant for all independent variables (p<0.05). Visually, there was marked spatial variation in the association between breast cancer screening rates and the significant independent variables from the global model. The identification of significant spatial variability in the association between breast cancer screening participation and important social and demographic factors provides important input into the design of programs aimed at increasing participation in screening regimes.

Hyperlocal disparities in breast, cervical, and colorectal cancer screening: An ecological study of social vulnerability in Miami-Dade county

Neighborhoods have been identified as important determinants of health-related outcomes, but limited research has assessed the influence of neighborhood context along the cancer continuum. This study used census tract-level data from the United States Census Bureau and Centers for Disease Control and Prevention to characterize Miami-Dade County census tracts (n = 492) into social vulnerability clusters and assess their associated breast, cervical, and colorectal cancer screening participation rates. We identified disparities by social vulnerability cluster in cancer screening participation rates. Further investigation of geographic disparities in social vulnerability and cancer screening participation could inform equity-focused cancer control efforts.

Impact of health disparities on national breast cancer screening participation rates in South Korea

Socioeconomic barriers to cancer screening exist at a regional level. The deprivation index is used to estimate socioeconomic gradients and health disparities across different geographical regions. We aimed to examine the impact of deprivation on breast cancer screening participation rates among South Korean women. Municipal breast cancer screening participation rates in women were extracted from the National Cancer Screening Information System and linked to the Korean version of the deprivation index constructed by the Korea Institute for Health and Social Affairs. A generalised linear mixed model was employed to investigate the association between the deprivation index and age-standardised breast cancer screening participation rates in 2005, 2012, and 2018. Participation rates increased gradually across all age groups from 2005 to 2018. Participants in their 60 s consistently had one of the highest participation rates (2005: 30.37%, 2012: 61.57%, 2018: 65.88%). In 2005, the most deprived quintile had a higher estimate of breast cancer screening participation than the least deprived quintile (2nd quintile; estimate: 1.044, p = 0.242, 3rd quintile; estimate: 1.153, p = 0.192, 4th quintile; estimate: 3.517, p = 0.001, 5th quintile; estimate: 6.913, p = < 0.0001). In 2012, the participation rate also increased as the level of deprivation increased. There were no statistically meaningful results in 2018. Regions with high deprivation have a higher participation rate in breast cancer screening. The role of health disparities in determining cancer outcomes among women in Korea requires further examination.

Associations between sociodemographic factors and breast, cervical, and colorectal cancer screening in the United States.

Cancer is the second leading cause of death globally and in the U.S., but screening can reduce cancer-related deaths. We analyzed data from a nationwide survey to compare how sociodemographic factors were associated with never or not timely screening for multiple types of cancer, and the use of different colorectal cancer screening procedures. We analyzed data from the 2019 U.S. National Health Interview Survey. To understand breast, cervical, and colorectal cancer screening participation among those recommended to screen, we respectively analyzed 8,110 women 45 to 74 years of age, 9,583 women 21 to 65 years of age, and 13,497 individuals 50 to 75 years of age at survey. Weighted Poisson regression was used to estimate the unadjusted and confounding-adjusted prevalence ratio and 95% confidence intervals. In our analysis populations, 6.9% never had a mammogram, 14.6% never screened for cervical cancer, and 26.8% never screened for colorectal cancer; the prevalence respectively increased to 24.7%, 23.8%, and 32.3% for not timely screening according to national guidelines. The prevalence of never screening was 81.9% for non-invasive colorectal cancer tests, compared with 32.5% for colonoscopy or sigmoidoscopy. Individuals with lower education level, with no health insurance, or in poverty had higher prevalence of never screening for all three cancers. There was low sociodemographic disparity for the use of non-invasive colorectal cancer screening tests. Socioeconomically disadvantaged individuals have higher prevalence of never or not timely screening. The utilization of non-invasive colorectal cancer screening procedures remains low across sociodemographic groups.

Beneficial effect of repeated participation in breast cancer screening upon survival.

The benefit of mammography screening in reducing population mortality from breast cancer is well established. In this paper, we estimate the effect of repeated participation at scheduled screens on case survival. We analysed incidence and survival data on 37,079 women from nine Swedish counties who had at least one to five invitation(s) to screening prior to diagnosis, and were diagnosed with breast cancer between 1992 and 2016. Of these, 4564 subsequently died of breast cancer. We estimated the association of survival with participation in up to the most recent five screens before diagnosis. We used proportional hazards regression to estimate the effect on survival of the number of scheduled screens in which subjects participated prior to the diagnosis of breast cancer. There was successively better survival with an increasing number of screens in which the subject participated. For a woman with five previous screening invitations who participated in all five, the hazard ratio was 0.28 (95% confidence interval (CI) 0.25-0.33, p < 0.0001) compared to a woman attending none (86.9% vs 68.9% 20-year survival). Following a conservative adjustment for potential self-selection factors, the hazard ratio was 0.34 (95% CI 0.26-0.43, p < 0.0001), an approximate three-fold reduction in the hazard of dying from breast cancer. For those women who develop breast cancer, regular prior participation in mammography screening confers significantly better survival.

The Correlation of Social Support and Fear of Breast Cancer among Women in Northeast of Iran: A Cross-Sectional Study.

Breast cancer (BC) is the most commonly diagnosed cancer worldwide. Screening programs are the most common prevention methods. Perceived social support and fear are two important factors affecting women's participation in breast cancer screening. This study aimed to determine the relationship between fear of BC and perceived social support among women in Torbat Heydarieh, northeast of Iran. This study is an online cross-sectional survey that was conducted on 352 women in Torbat Heydarieh city of Northeast Iran, from October 26th, 2021 to December 26th, 2022. Along with collecting sociodemographic characteristics, the Breast Cancer Fear Scale (BCFS), and the Multidimensional Scale of Perceived Social Support were electronically administered to participants. Data were analyzed through SPSS software version 25, using independent samples t-tests, one-way analysis, Pearson's correlation coefficient, and multiple linear regression models. The statistical significance level was set at P<0.05. The mean score for the BCFS was 20.67±1.03 which was in the moderate range for the total score of 40. Assessment of perceived social support indicated a moderate level of perceived support for all dimensions. Also, a significant correlation was found between the women's BCFS scores and perceived social support (r=-0.29, P<0.001). We found that there was a negative statistically significant correlation between the BCF and social support. Therefore, this study suggests that healthcare providers pay attention to these factors. Moreover, further research is needed to explore the long-term effects of BCF due to low social support.

Breast cancer screening participation in women using mental health services in NSW, Australia: a population study

PurposePopulation screening programs have contributed to reduced breast cancer mortality, but disadvantaged or vulnerable groups may not have shared these improvements. In North American and European studies, women living with mental health conditions have reduced breast screening rates. There are no current Australasian data to support health system planning and improvement strategies.MethodsThe New South Wales (NSW) BreastScreen program offers free screening to NSW women aged 50–74. We compared 2-year breast screening rates for mental health service users (n = 33,951) and other NSW women (n = 1,051,495) in this target age range, after standardisation for age, socioeconomic status and region of residence. Mental health service contacts were identified through linkage to hospital and community mental health data.ResultsOnly 30.3% of mental health service users participated in breast screening, compared with 52.7% of other NSW women (crude incidence rate ratio 0.57, 95% CI 0.56–0.59). Standardisation for age, socioeconomic disadvantage or rural residence did not alter this screening gap. Around 7000 fewer women received screening than would be expected from comparable population rates. Screening gaps were largest in women over 60 and in socioeconomically advantaged areas. Women with severe or persistent mental illness had slightly higher screening rates than other mental health service users.ConclusionsLow breast cancer screening participation rates for NSW mental health service users suggest significant risk of later detection, possibly leading to more extensive treatment and premature mortality. Focussed strategies are needed to support greater breast screening participation for NSW women who use mental health services.

Evaluation of a population-based breast cancer screening in North China

BackgroundDespite mammography-based screening for breast cancer has been conducted in many countries, there are still little data on participation and diagnostic yield in population-based breast cancer screening in China.MethodsWe enrolled 151,973 eligible women from four cities in Hebei Province within the period 2013–2021 and followed up until December 31, 2021. Participants aged 40–74 who assessed as high risk were invited to undergo breast ultrasound and mammography examination. Overall and group-specific participation rates were calculated. Multivariable analyses were used to estimate the factors associated with participation rates. The diagnostic yield of both screening and no screening groups was calculated. We further analyzed the stage distribution and molecular subtype of breast cancer cases by different modes of cancer detection.ResultsA total of 42,547 participants were evaluated to be high risk of breast cancer. Among them, 23,009 subjects undertook screening services, with participation rate of 54.08%. Multivariable logistic regression model showed that aged 45–64, high education level, postmenopausal, current smoking, alcohol consumption, family history of breast cancer, and benign breast disease were associated with increased participation of screening. After median follow-up of 3.79 years, there were 456 breast cancer diagnoses of which 65 were screen-detected breast cancers (SBCs), 27 were interval breast cancers (IBCs), 68 were no screening cancers, and 296 were cancers detected outside the screening program. Among them, 92 participants in the screening group (0.40%) and 364 in the non-screening group (0.28%) had breast cancer detected, which resulted in an odds ratio of 1.42 (95% CI 1.13–1.78; P = 0.003). We observed a higher detection rate of breast cancer in the screening group, with ORs of 2.42 (95% CI 1.72–3.41) for early stage (stages 0–I) and 2.12 (95% CI 1.26–3.54) for luminal A subtype. SBCs had higher proportion of early stage (71.93%) and luminal A subtype (47.22%) than other groups.ConclusionsThe significant differences in breast cancer diagnosis between the screening and non-screening group imply an urgent need for increased breast cancer awareness and early detection in China.