Variation in performance in low-volume mammography screening programmes: experience from Switzerland

Screening is associated with lower mastectomy rates in eastern Switzerland beyond stage effects

Background

A recent study found an influence of organized mammography screening programmes (MSPs) on geographical and temporal variation of mastectomy rates. We aimed to quantify the effect on the example of one of the cantonal programmes in Switzerland.

Methods

We used incidence data for the years 2010–2017 from the cancer registry of Eastern Switzerland. We included women with invasive-non-metastatic breast cancer (BC) in the screening age group 50–69-year-olds in the canton of St.Gallen. We compared mastectomy rates among cancer patients detected through the organised screening programme (MSP) vs. otherwise detected by stage.

Results

MSP-detected patients in St.Gallen presented with lower stages. 95% of MSP-detected had stages I-II vs 76% of Non-MSP-detected. Within all non-metastatic stage, tumour size and nodal status groups, MSP-detected patients had lower mastectomy rates, overall 10% vs 24% in 50–69-year-old non-participants. Their odds of receiving a mastectomy are about half of the Non-MSP-detected (OR = 0.48, p = 0.002).

Conclusions

Our study showed that MSPs have a positive effect on lowering mastectomy rates. Screening participants are significantly less likely to receive a mastectomy compared to non-participants, which must be attributed to additional factors than just lower stages. Lower mastectomy rates lead to a higher quality of life for many patients.

Variation of colorectal, breast and prostate cancer screening activity in Switzerland: Influence of insurance, policy and guidelines

Variation in utilization of healthcare services is influenced by patient, provider and healthcare system characteristics. It could also be related to the evidence supporting their use, as reflected in the availability and strength of recommendations in clinical guidelines. In this study, we analyzed the geographic variation of colorectal, breast and prostate cancer screening utilization in Switzerland and the influence of available guidelines and different modifiers of access. Colonoscopy, mammography and prostate specific antigen (PSA) testing use in eligible population in 2014 was assessed with administrative claims data. We ran a multilevel multivariable logistic regression model and calculated Moran's I and regional level median odds ratio (MOR) statistics to explore residual geographic variation. In total, an estimated 8.1% of eligible persons received colonoscopy, 22.3% mammography and 31.3% PSA testing. Low deductibles, supplementary health insurance and enrollment in a managed care plan were associated with higher screening utilization. Cantonal breast cancer screening programs were also associated with higher utilization. Spatial clustering was observed in the raw regional utilization of all services, but only for prostate cancer screening in regional residuals of the multilevel model. MOR was highest for prostate cancer screening (1.24) and lowest for colorectal cancer screening (1.16). The reasons for the variation of the prostate cancer screening utilization, not recommended routinely without explicit shared decision-making, could be further investigated by adding provider characteristics and patient preference information. This first cross-comparison of different cancer screening patterns indicates that the strength of recommendations, mediated by specific health policies facilitating screening, may indeed contribute to variation.

The impact of depression on adherence to organized and opportunistic breast cancer screening

One in five women will experience depression over her lifetime, and one out of eight will develop breast cancer. We evaluated the effect of depression on adherence to mammography in Switzerland, where opportunistic and organized screening programs coexist. We analyzed data from 3206 women aged 50-69 who participated in the Swiss Health Survey 2012. We compared mammographic rates among women with no to mild versus moderate to severe depressive symptoms. The effect of the type of screening on the odds of undertaking a mammography was calculated using multivariable logistic regression analysis. Women with moderate to severe major depressive symptoms were more likely to have had a mammography in the previous 2 years than their nondepressed or less-depressed counterparts (51 vs. 39.2%, respectively, P = 0.005). In the multivariable analysis, women with no to mild major depression living in cantons with an organized screening program had an adjusted odds ratio of 2.7 (95% confidence interval: 2.30-3.17, P < 0.001) of having had a mammography within the past 24 months compared with those living in the regions with an opportunistic screening. The adjusted odds ratio for women with moderate to severe major depression was 4.21 (95% confidence interval: 2.13-8.33, P < 0.001). In Switzerland. adherence to mammographic screening among women with moderate to severe major depression is higher than among women with no or minimal major depressive symptoms. This increased adherence is even more pronounced in regions with organized screening.

Breast cancer screening attendance in two Swiss regions dominated by opportunistic or organized screening

BACKGROUND

In Switzerland, the French-speaking region has an organized breast cancer (BC) screening program; in the German-speaking region, only opportunistic screening until recently had been offered. We evaluated factors associated with attendance to breast cancer screening in these two regions.

METHODS

We analyzed the data of 50-69 year-old women (n = 2769) from the Swiss Health Survey 2012. Factors of interest included education level, place of residence, nationality, marital status, smoking history, alcohol consumption, physical activity, diet, self-perceived health, history of chronic diseases and mental distress, visits to medical doctors and cervical and colorectal cancer screening. Outcome measures were dichotomized into ≤2 years since most recent mammography versus >2 years or never.

RESULTS

In the German- and French-speaking regions, mammography attendance within the last two years was 34.9 % and 77.8 %, respectively. In the French region, moderate alcohol consumption (adjusted OR 2.01, 95 % CI 1.28-3.15) increased screening attendance. Compared to those with no visit to a physician during the recent year, women in both regions with such visits attended statistically significantly more often BC screening (1-5 times vs. no visit: German (adjusted OR 3.96, 95 % CI 2.58-6.09); French: OR 7.25, 95 % CI 4.04-13.01). Non-attendance to cervical screening had a negative effect in both the German (adjusted OR 0.44, 95 % CI 0.25-0.79) and the French region (adjusted OR 0.57, 95 % CI 0.35-0.91). The same was true for colorectal cancer screening (German (adjusted OR 0.66, 95 % CI 0.52-0.84); French: OR 0.52, 95 % CI 0.33-0.83). No other factor was associated with BC screening and none of the tests of interaction comparing the two regions revealed statistically significant results.

CONCLUSION

The effect of socio-demographic characteristics, lifestyle, health factors and screening behavior other than mammography on non-attendance to BC screening did not differ between the two regions with mainly opportunistic and organized screening, respectively, and did not explain the large differences in attendance between regions. Other potential explanations such as public promotion of attendance for BC screening, physicians' recommendations regarding mammography participation or women's beliefs should be further investigated.