[Scoping review on cancer prevention in immigrants living in Spain]

Intersectional analysis of inequalities in self-reported breast cancer screening attendance using supervised machine learning and PROGRESS-Plus framework

Background

Breast cancer is a critical public health concern in Spain, and organized screening programs have been in place since the 1990s to reduce its incidence. However, despite the bi-annual invitation for breast cancer screening (BCS) for women aged 45-69, significant attendance inequalities persist among different population groups. This study employs a quantitative intersectional perspective to identify intersectional positions at risk of not undergoing breast cancer screening in Spain.

Methods

Women were selected from the 2020 European Health Interview Survey in Spain, which surveyed the adult population (> 15 years old) living in private households (N = 22,072; 59% response rate). Inequality indicators based on the PROGRESS-Plus framework were used to disentangle existing social intersections. To identify intersectional groups, decision tree models, including classification and regression trees (CARTs), chi-squared automatic interaction detector (CHAID), conditional inference rees (CITs), and C5.0, along with an ensemble algorithm, extreme gradient boosting (XGBoost), were applied.

Results

XGBoost (AUC 78.8%) identified regional differences (Autonomous Community) as the most important factor for classifying BCS attendance, followed by education, age, and marital status. The C5.0 model (balanced accuracy 81.1%) highlighted that the relative importance of individual characteristics, such as education, marital status, or age, for attendance differs based on women's place of residence and their degree of interaction. The highest risk of not attending BCS was observed among illiterate older women in lower social classes who were born in Spain, were residing in Asturias, Cantabria, Basque Country, Castile and León, Extremadura, Galicia, Madrid, Murcia, La Rioja, or Valencian Community, and were married, divorced, or widowed. Subsequently, the risk of not attending BCS extends to three other groups of women: women living in Ceuta and Melilla; single or legally separated women living in the rest of Spain; and women not born in Spain who were married, divorced, or widowed and not residing in Ceuta or Melilla.

Conclusion

The combined use of decision trees and ensemble algorithms can be a valuable tool in identifying intersectional positions at a higher risk of not utilizing public resources and, thus, can aid substantially in developing targeted interventions to increase BCS attendance.

Sexual dimorphism in the incidence of human cancers

Background

Sex differences in the incidences of cancers become a critical issue in both cancer research and the development of precision medicine. However, details in these differences have not been well reported. We provide a comprehensive analysis of sexual dimorphism in human cancers.

Methods

We analyzed four sets of cancer incidence data from the SEER (USA, 1975–2015), from the Cancer Registry at Mayo Clinic (1970–2015), from Sweden (1970–2015), and from the World Cancer Report in 2012.

Results

We found that all human cancers had statistically significant sexual dimorphism with male dominance in the United States and mostly significant in the Mayo Clinic, Sweden, and the world data, except for thyroid cancer, which is female-dominant.

Conclusions

Sexual dimorphism is a clear but mostly neglected phenotype for most human cancers regarding the clinical practice of cancer. We expect that our study will facilitate the mechanistic studies of sexual dimorphism in human cancers. We believe that fully addressing the mechanisms of sexual dimorphism in human cancers will greatly benefit current development of individualized precision medicine beginning from the sex-specific diagnosis, prognosis, and treatment.

Electronic supplementary material

The online version of this article (10.1186/s12885-019-5902-z) contains supplementary material, which is available to authorized users.

[Social integration and gynecologic cancer screening of immigrant women in Spain]

OBJECTIVE

To explore the association between immigrant status and performance of pap-smear and mammography, and to study the potential effect of social integration on that association.

METHOD

Secondary analysis of the National Health Survey of Spain 2012. Individual data from 8944 women aged 18-75 were analyzed. Dependent variables were the performance of pap-smear tests and mammographies according to the guidelines of the state of residence. The level of integration in Spain was estimated through perceived social support (Duke-UNC scale) and the number of years living in Spain. Logistic regressions were used in order to obtain odds ratios (OR) and their 95% confidence intervals (95%CI), adjusted for confounders (sociodemographic and health-status).

RESULTS

Compared to natives, immigrant women were more likely to not adhere to cervical cancer screening (OR: 1.31; 95%CI: 1.06-1.63) or breast cancer screening (OR:=3.13; 95%CI: 2.14-4.58). Additional adjustment by social support and length of residence in Spain attenuated the association, consequently losing statistical significance (OR: 1.08, 95%CI: .77-1.52 for pap-smear; OR: 1.62, 95%CI: .97-2.74 for mammographies).

CONCLUSIONS

The probability of participating in the screening programs for gynecological cancer was lower if women were born abroad. Perceived social support and time living in Spain of immigrant women explained to a large extent the differences between immigrants and natives.

[Participation of the immigrant population in breast cancer screening in Tarragona, Spain]

OBJECTIVE

To evaluate the differences between autochthonous and allochthonous women's participation in a breast cancer screening programme.

METHOD

Retrospective study based on data from the Breast Cancer Screening Programme of the province of Tarragona (2008-2015). The sample is the target population of the programme with known country of origin.

RESULTS

Cohort of 40,824 women. Allochthonous women participate less than autochthonous women (41.8% vs. 72.3%) although they have a similar global detection rate to the latter but with differences according to the human development index of their country of origin. Both groups present similar tumour stages on detection (p=.59).

CONCLUSIONS

Strategies specifically aimed at the immigrant population are required to improve their participation in breast cancer screening.

Hospitalizations for cancer in international migrants versus local population in Chile

OBJECTIVE

To compare cancer hospital morbidity among the local population and the immigrant population in Chile.

METHODS

This is a prevalence study based on the analysis of hospital discharges of all the health centers of Chile. Cancer hospital discharges were characterized in 2012 according to the migratory status. The crude and specific rates of hospital morbidity for this cause were estimated for the analysis of their association with migratory status using zero-inflated negative binomial regression, adjusted for sociodemographic variables.

RESULTS

The neoplasms were the third cause of hospital discharges for immigrants and the seventh one for Chileans. The adjusted rate of cancer hospital discharges was higher for Chileans than immigrants, and the latter had fewer days of hospitalization and greater proportion of surgical interventions. In the group of immigrants, cancer hospital discharges mainly corresponded to patients belonging to the private system (46%), and in the group of Chileans they mainly corresponded to patients in the public system (71.1%). We observed a large difference in the proportion of cancer hospital discharges for patients with no health insurance between the two populations (22.6%: immigrants, 1.0%: Chileans). In both populations, the three most frequent types of cancer were: (i) lymphoid tissue, hematopoietic organs, and related tissues, (ii) digestive organs, and (iii) breast cancer.

CONCLUSIONS

Models of differentiated care should be considered for immigrants, with the creation of specific programs of information, coverage, and protection against cancer. More information on this problem must be generated at the local and international level.

[Prevalence in the performance of mammographies in Spain: Analysis by Communities 2006-2014 and influencing factors]

OBJECTIVE

To determine the frequency of the performance of mammography with preventive purpose of the screening of breast cancer in Spanish women, the evolution between the years 2006-2014, the sociodemographic profile of the women who undergo the mammography and to analyze the factors that influence in their adhesion.

DESIGN

Transversal study.

SITES

Spain.

PARTICIPANTS

A total of 53.628 women over 15 years old that are surveyed in the National Health Survey in Spain 2006 and 2011/12 and the European Health Survey in Spain 2009 and 2014.

MEASUREMENTS

The following variables were used: mammography, frequency of mammography performance and the reason for the realization, as well as sociodemographic variables. Social class was obtained from the last occupation of the main family supporter. A logistic regression analysis was performed with sociodemographic variables.

RESULTS

The prevalence of mammography has been increasing from 2006 to 2014, and also for the reason that the participants had received a letter, they were telephoned or offered in their Health Center to undergo this test. There are significant differences in the performance of mammography in the different autonomous communities.

CONCLUSIONS

Performing mammography has increased significantly from 2006 to 2014, although there are still differences between autonomous communities, with Ceuta and Melilla being the least percentage of performed mammography. The factors that are related to greater performed mammography are: higher educational level, higher social class, married civil status, Spanish nationality and age.

[Socioeconomic inequalities in mammography screening in Spanish women aged 45 to 69]

OBJECTIVE

To analyse mammography screening in Spanish women aged 45 to 69 according sociodemographic variables and to describe the role of population-based breast cancer screening programmes in terms of variability of said screening.

METHODS

Cross-sectional study of the 2011 National Health Survey. The study population includes women living in Spain between late 2011 and early 2012. The weighted sample analysed corresponds to 3,086 women aged 45 to 69. The dependent variables were mammograms and when the last mammogram was performed and why. Independent variables were age, social class, occupational status, country of origin, area of origin (rural/urban), health cover and years the programme had been in place. Logistic regression models were performed, with odds ratio (OR) adjusted according to age and 95% confidence intervals (95% CI).

RESULTS

Approximately 91.9% indicated that they had had a mammogram before. The women who had had their last mammography screening in the previous 1 to 2 years were associated with the highest social class (OR: 1.69; 95% CI: 1.03-2.75). The reason for performing the last periodic mammogram via a population-based programme was associated with women aged between 60 and 69 years (OR: 1.51; 95% CI: 1.04-2.19).

CONCLUSIONS

The results show that there are still inequalities in preventive practices. Possible risk groups need to be identified in order to promote the implementation of specific actions.