Breast Cancer Screening and Care Among Black Sexual Minority Women: A Scoping Review of the Literature from 1990 to 2017

An examination of the independent and intersectional effects of racial and heterosexist medical mistrust on timing of sexual/reproductive health care visits among Black sexual minority women in the USA

Experiences of racism and heterosexism in medical settings are social and systemic barriers to 'on-time' receipt of sexual and reproductive health services among women with both racial and sexual minority identities. Medical mistrust based on experiences related to these dual identities is associated with avoidance and delays in care. However, investigators are just beginning to apply an intersectional lens to quantitatively understanding such barriers. The purpose of this study was to examine the independent and interaction effects of racial and heterosexist medical mistrust on timing of sexual/reproductive health care among Black sexual minority women who have sex with women and men. A total of 320 women participated in an online study of factors affecting sexual health in this population. Ordinal logistic regression was used to assess the independent and interaction effects of racial and heterosexist medical mistrust on self-reported time since last sexual/reproductive health visit. Results indicated an interaction between the two types of medical mistrust. Research on Black women who have sex with women and men's experiences of racism and heterosexism in the US healthcare system can lead to the development of the comprehensive training programmes needed to alleviate medical mistrust among women with racial and sexual minority identities.

Understanding and tackling cancer inequities: What opportunities does intersectionality offer researchers, policymakers, and providers? A scoping review

PROBLEM IDENTIFICATION

We summarised the international evidence relating to the role of intersectionality in patients' lived experience of inequities along the cancer care pathway. We produced guidance to use intersectionality in future research.

LITERATURE SEARCH

We included 42 articles published between 1989 to 2023 that used intersectionality to guide the study and interpretation of inequities in cancer care.

DATA EVALUATION/SYNTHESIS

Articles predominantly comprised North American (n = 37), followed by European (n = 4) and Asian (n = 1) studies. Similar compounding effects of racism, homophobia, and discrimination across countries exacerbated inequities in cancer care experience and cancer outcomes particularly for women of color and sexual/gender minority groups. Professionals' knowledge, attitudes, and behaviors toward minoritised groups affected patient-provider relationships and influenced cancer patients' psychosocial responses.

CONCLUSION

Intersectionality provides a framework to assess the personal, interpersonal, and structural processes through which cancer inequities manifest within and across countries.

Sexual and Reproductive Justice and Health Equity for LGBTQ+ Women

LGBTQ+ women have long been overlooked in sexual and reproductive health research. However, recent research has established that LGBTQ+ women have unique and specific needs that need to be addressed in order to improve effectiveness of sexual health education and practice with this historically and presently underserved population. Informed by a reproductive justice framework coupled with liberation psychology theory, this review discusses the current state of sexual and reproductive health and technologies among LGBTQ+ women. In particular, we focus on a range of HIV prevention and reproductive technologies and their use and promotion, including the internal condom, abortion, oral contraceptives, dapivirine ring, HIV pre-exposure prophylaxis, intrauterine device, and other less studied options, such as the contraceptive sponge. Grounded in an intersectional framing, this review acknowledges the intersecting systems of oppression that affect multiply marginalized women inequitably and disproportionately. A sociohistorical, critical lens is applied to acknowledge the well-documented racist origins of reproductive health technologies and ongoing coercive practices that have led to medical mistrust among marginalized and stigmatized communities, particularly racialized LGBTQ+ women, women with disabilities, and women who are poor or incarcerated. Moreover, we discuss the urgent need to center LGBTQ+ women in research and clinical care, community-engaged health promotion efforts, affirming non-heteronormative sexual health education, and health policies that prioritize autonomy and dismantle structural barriers for this population. We conclude with recommendations and future directions in this area to remedy entrenched disparities in health.

Scoping review of experiences of sexual minority women treated for breast cancer

PURPOSE

To summarize and critique research on the experiences and outcomes of sexual minority women (SMW) treated with surgery for breast cancer through systematic literature review.

METHODS

A comprehensive literature search identified studies from the last 20 years addressing surgical experiences and outcomes of SMW breast cancer survivors. Authors performed a quality assessment and thematic content analysis to identify emergent themes.

RESULTS

The search yielded 121 records; eight qualitative studies were included in the final critical appraisal. Quality scores for included studies ranged 6-8 out of 10. Experiences and outcomes of SMW breast cancer survivors were organized by major themes: 1) Individual, 2) Interpersonal, 3) Healthcare System, and 4) Sociocultural and Discursive.

CONCLUSIONS

SMW breast cancer survivors have unique experiences of treatment access, decision-making, and quality of life in survivorship. SMW breast cancer survivors' personal values, preferences, and support network are critical considerations for researchers and clinicians.

Effect of neighborhood and individual-level socioeconomic factors on breast cancer screening adherence in a multi-ethnic study

BACKGROUND

Although mammography can significantly reduce breast cancer mortality, many women do not receive their annual breast cancer screening. Differences in screening adherence exist by race/ethnicity, socioeconomic status (SES), and insurance status. However, more detailed investigations into the impact of neighborhood disadvantage and access to resources on screening adherence are lacking.

METHODS

We comprehensively examined the effect of individual social, economic, and demographic factors (n = 34 variables), as well as neighborhood level SES (nSES) indicators (n = 10 variables) on breast cancer screening adherence across a multi-ethnic population (n = 472). In this cross-sectional study, participants were surveyed from 2017 to 2018. The data was analyzed using univariate regression and LASSO for variable reduction. Significant predictors were carried forward into final multivariable mixed-effect logistic regression models where odds ratios (OR), 95% confidence intervals and p-values were reported.

RESULTS

Nineteen percent of participants were non-adherent to breast screening guidelines. Race/ethnicity was not associated with adherence; however, increasing age (OR = 0.97, 95%CI = 0.95-0.99, p = 0.01), renting a home (OR = 0.53, 95%CI = 0.30-0.94, p = 0.04), food insecurity (OR 0.46, 95%CI = 0.22-0.94, p = 0.01), and overcrowding (OR = 0.58, 95% CI = 0.32-0.94, p = 0.01) were significantly associated with lower breast cancer screening adherence.

CONCLUSION

Socioeconomic indicators at the individual and neighborhood levels impact low breast cancer screening adherence and may help to inform future screening interventions.

Data gaps and opportunities for modeling cancer health equity

Population models of cancer reflect the overall US population by drawing on numerous existing data resources for parameter inputs and calibration targets. Models require data inputs that are appropriately representative, collected in a harmonized manner, have minimal missing or inaccurate values, and reflect adequate sample sizes. Data resource priorities for population modeling to support cancer health equity include increasing the availability of data that 1) arise from uninsured and underinsured individuals and those traditionally not included in health-care delivery studies, 2) reflect relevant exposures for groups historically and intentionally excluded across the full cancer control continuum, 3) disaggregate categories (race, ethnicity, socioeconomic status, gender, sexual orientation, etc.) and their intersections that conceal important variation in health outcomes, 4) identify specific populations of interest in clinical databases whose health outcomes have been understudied, 5) enhance health records through expanded data elements and linkage with other data types (eg, patient surveys, provider and/or facility level information, neighborhood data), 6) decrease missing and misclassified data from historically underrecognized populations, and 7) capture potential measures or effects of systemic racism and corresponding intervenable targets for change.

Engaging Black sexual minority women in breast cancer research: Lessons in community partnerships

BACKGROUND

Black sexual minority women (BSMW) face significant breast cancer health inequities and are underrepresented in health research because of historical and present-day exclusion. However, there exists no peer-reviewed literature on best practices for the inclusion of BSMW in cancer research. "Our Breast Health: The Access Project" was a national primary data collection study in June 2018 through October 2019 that aimed to identify facilitators and barriers to breast cancer care among BSMW, and that successfully recruited the highest number of BSMW for any national breast cancer screening study at the time of its publication.

METHODS

The present analysis highlights best practices for reaching BSMW by examining by how effective various recruitment sources were at recruiting BSMW. Recruitment partners were grouped into several categories: (1) cancer focused, (2) Black women or sexual minority women focused, (3) BSMW focused, (4) social media, and (5) other. Then logistic regression was used to estimate the odds that a particular recruitment source category could recruit BSMW compared with other categories.

RESULTS

Partnerships with community-based organizations led by and intended for BSMW were the most successful at recruiting BSMW, demonstrating the importance of an intersectional approach to recruitment. Community-based organizations focused on BSMW specifically were 26 times more successful in recruiting BSMW to the study compared with recruiting Black women who were not sexual minorities (odds ratio, 26.43 [95% CI, 7.50-93.10]).

CONCLUSIONS

Successful recruitment enables breast cancer research grounded in the perspectives of BSMW, which can generate key findings that have the potential to remedy longstanding health inequities for this population.

Disparities in cancer care among sexual and gender minority adolescent and young adult patients: A scoping review

BACKGROUND

Adolescent and young adult cancer patients (AYAs) who are sexual and gender minorities (SGM) are a rapidly increasing population that experiences unmet cancer-related needs. Despite emerging awareness, little is known about cancer care and outcomes for this vulnerable population. The purpose of this scoping review was to explore current knowledge and gaps in the literature on cancer care and outcomes for AYAs who identify as SGM.

METHODS

We reviewed empirical knowledge on SGM AYAs by identifying, describing, and critically appraising the literature to date. We conducted a comprehensive search on OVID MEDLINE, PsycINFO, and CINAHL in February 2022. Additionally, we developed and piloted a conceptual framework for appraising SGM AYA research.

RESULTS

A total of 37 articles were included in the final review. Most studies focused exclusively on SGM-related outcomes as the primary aim of the study (81.1%, n = 30), whereas others included some focus on SGM-related outcomes (18.9%, n = 7). The majority of studies included AYAs as part of a broader age range (86.0%, n = 32), and only a few studies examined exclusively AYA samples (14.0%, n = 5). Gaps in scientific evidence on SGM AYAs were seen across the cancer care continuum.

CONCLUSION

Numerous gaps in knowledge of cancer care and outcomes exist for SGM AYAs diagnosed with cancer. Future efforts should fill this void with high-quality empirical studies that reveal unknown disparities in care and outcomes and are inclusive of the intersectionality of SGM AYAs with other minoritized experiences, thereby advancing health equity in meaningful ways.

Psychosexual responses to BRCA gene mutations in women of childbearing age

BACKGROUND

Diagnosis of a BRCA gene mutation presents a dilemma because life-changing medical decisions must be made to prevent breast and ovarian cancer. There is minimal evidence regarding how psychosexual functioning, psychological well-being with regard to body image and sexuality, affects the decision to have prophylactic treatment in women of childbearing age (WCBA; 18-49 years) with a BRCA gene mutation.

PURPOSE

To explore, describe, and interpret the experience of women with a BRCA mutation during the treatment and decision-making process.

METHODOLOGY

A qualitative descriptive design was used to recruit participants online through social media postings and from national and local BRCA support groups. Participants participated in semistructured interviews exploring their experience after BRCA diagnosis. Interpretive descriptive analysis was used to identify themes.

RESULTS

The purposive sample comprised 18 women aged 21-49 years. Four major themes, such as body image, sexuality, femininity, and childbearing/childrearing, were identified that influenced decisions related to the diagnosis and management of a BRCA mutation. All participants voiced that concerns regarding body image and sexuality caused hesitancy in their decision to have prophylactic surgery. Women who had undergone bilateral prophylactic mastectomy were concerned about the impact of the surgery, scarring, breast disfigurement, and the lack of sensation resulting from surgical intervention.

CONCLUSIONS

Psychosexual concerns arise from internal and external influences that significantly affect the decision to undergo prophylactic measures. Therefore, body image, sexuality, and sexual orientation should all be addressed during the decision-making process.

IMPLICATIONS

Provider communication and preparation for realistic surgical outcomes can be improved to assist WCBA throughout the decision-making process and enhance psychosexual functioning.

Breast Cancer Diagnosis, Treatment, and Outcomes of Patients From Sex and Gender Minority Groups

Importance

Sexual orientation and gender identity data are not collected by most hospitals or cancer registries; thus, little is known about the quality of breast cancer treatment for patients from sex and gender minority (SGM) groups.

Objective

To evaluate the quality of breast cancer treatment and recurrence outcomes for patients from SGM groups compared with cisgender heterosexual patients.

Design, Setting, and Participants

Exposure-matched retrospective case-control study of 92 patients from SGM groups treated at an academic medical center from January 1, 2008, to January 1, 2022, matched to cisgender heterosexual patients with breast cancer by year of diagnosis, age, tumor stage, estrogen receptor status, and ERBB2 (HER2) status.

Main Outcomes and Measures

Patient demographic and clinical characteristics, as well as treatment quality, as measured by missed guideline-based breast cancer screening, appropriate referral for genetic counseling and testing, mastectomy vs lumpectomy, receipt of chest reconstruction, adjuvant radiation therapy after lumpectomy, neoadjuvant chemotherapy for stage III disease, antiestrogen therapy for at least 5 years for estrogen receptor-positive disease, ERBB2-directed therapy for ERBB2-positive disease, patient refusal of an oncologist-recommended treatment, time from symptom onset to tissue diagnosis, time from diagnosis to first treatment, and time from breast cancer diagnosis to first recurrence. Results were adjusted for multiple hypothesis testing. Compared with cisgender heterosexual patients, those from SGM groups were hypothesized to have disparities in 1 or more of these quality metrics.

Results

Ninety-two patients from SGM groups were matched to 92 cisgender heterosexual patients (n = 184). The median age at diagnosis for all patients was 49 years (IQR, 43-56 years); 74 were lesbian (80%), 12 were bisexual (13%), and 6 were transgender (6%). Compared with cisgender heterosexual patients, those from SGM groups experienced a delay in time from symptom onset to diagnosis (median time to diagnosis, 34 vs 64 days; multivariable adjusted hazard ratio, 0.65; 95% CI, 0.42-0.99; P = .04), were more likely to decline an oncologist-recommended treatment modality (35 [38%] vs 18 [20%]; multivariable adjusted odds ratio, 2.27; 95% CI, 1.09-4.74; P = .03), and were more likely to experience a breast cancer recurrence (multivariable adjusted hazard ratio, 3.07; 95% CI, 1.56-6.03; P = .001).

Conclusions and Relevance

This study found that among patients with breast cancer, those from SGM groups experienced delayed diagnosis, with faster recurrence at a 3-fold higher rate compared with cisgender heterosexual patients. These results suggest disparities in the care of patients from SGM groups and warrant further study to inform interventions.

Health inequities in mammography: A scoping review

OBJECTIVE

The objective of this scoping review is to chart the existing evidence on health inequities related to mammography and identify existing knowledge gaps to guide future research.

METHODS

This scoping review followed guidelines from the Joanna Briggs Institute and the PRISMA extension for scoping reviews. In July 2022, we searched PubMed and Ovid Embase for published articles on mammography screening, published between 2011 and 2021, written in English, and examining at least one health inequity as defined by the NIH. Screening and charting were both performed in a masked, duplicate manner. Frequencies of each health inequity examined were analyzed and main findings from each included study were summarized.

RESULTS

Following screening, our sample consisted of 128 studies. Our findings indicate that mammography screening was less likely in historically marginalized groups, patients who live in rural areas, and in women with low income status and education level. Significant research gaps were observed regarding the LGBTQ + community and sex and gender. No trends between inequities investigated over time were identified.

DISCUSSION

This scoping review highlights the gaps in inequities research regarding mammography, as well as the limited consensus across findings. To bridge existing research gaps, we recommend research into the following: 1) assessments of physician knowledge on the LGBTQ + community guidelines, 2) tools for health literacy, and 3) culturally competent screening models.

A Systematic Review of Black American Same-Sex Couples Research: Laying the Groundwork for Culturally-Specific Research and Interventions

ABSTRACTThis article presents the findings of a systematic review of the empirical literature related to Black American same-sex couples (BASCs). We found 16 articles that met inclusion criteria. Most articles were published in journals that focused on interdisciplinary studies, HIV/AIDS, and couples and families' studies. Approximately 63% of the articles reported external funding support. However, only one of these grants was awarded to a Black investigator. Articles predominately focused on BASCs composed of Black sexual minority men residing in major U.S. cities. Only 25% of the articles focused on couples where both partners were Black. Most studies were cross-sectional, used convenience samples, and were reported without mention of a theoretical framework that explicated the philosophical assumptions that guided the research. The articles focused on a range of topics such as resilience, relationship dynamics, couple-level social support, rituals with extended families, and partner-health associations. The implications of these findings for advancing culturally-specific behavioral and social science health research and interventions with BASCs are presented.

Intersectionality and the Surgical Patient: Expanding the Surgical Disparities Framework

There are currently no surgical disparities frameworks that include patients with multiple social identities. This perspective provides an overview of the concept of intersectionality and provides a framework to evaluate intersectionality in surgical disparities research.

A review of the berberine natural polysaccharide nanostructures as potential anticancer and antibacterial agents

Despite the promising medicinal properties, berberine (BBR), due to its relatively poor solubility in plasma, low bio-stability and limited bioavailability is not used broadly in clinical stages. Due to these drawbacks, drug delivery systems (DDSs) based on nanoscale natural polysaccharides, are applied to address these concerns. Natural polymers are biodegradable, non-immunogenic, biocompatible, and non-toxic agents that are capable of trapping large amounts of hydrophobic compounds in relatively small volumes. The use of nanoscale natural polysaccharide improves the stability and pharmacokinetics of the small molecules and, consequently, increases the therapeutic effects and reduces the side effects of the small molecules. Therefore, this paper presents an overview of the different methods used for increasing the BBR solubility and bioavailability. Afterwards, the pharmacodynamic and pharmacokinetic of BBR nanostructures were discussed followed by the introduction of natural polysaccharides of plant (cyclodextrines, glucomannan), the shells of crustaceans (chitosan), and the cell wall of brown marine algae (alginate)-based origins used to improve the dissolution rate of poorly soluble BBR and their anticancer and antibacterial properties. Finally, the anticancer and antibacterial mechanisms of free BBR and BBR nanostructures were surveyed. In conclusion, this review may pave the way for providing some useful data in the development of BBR-based platforms for clinical applications.

Delays in breast cancer care by race and sexual orientation: Results from a national survey with diverse women in the United States

BACKGROUND

Despite known differences in breast cancer by both race and sexual orientation, data on the intersectional experiences of Black sexual minority women (BSMW) along the care continuum are scant. This study sought to understand delays in breast cancer care by examining the intersection of race and sexual orientation.

METHODS

This online, cross-sectional survey enrolled racially and sexually diverse women aged ≥ 35 years who had been diagnosed with breast cancer within the prior 10 years or had an abnormal screening in the prior 24 months. The authors calculated summary statistics by race/sexual orientation categories, and they conducted univariate and multivariable modeling by using multiple imputation for missing data.

RESULTS

BSMW (n = 101) had the highest prevalence of care delays with 5.17-fold increased odds of a care delay in comparison with White heterosexual women (n = 298) in multivariable models. BSMW reported higher intersectional stigma and lower social support than all other groups. In models adjusted for race, sexual orientation, and income, intersectional stigma was associated with a 2.43-fold increase in care delays, and social support was associated with a 32% decrease in the odds of a care delay.

CONCLUSIONS

Intersectional stigma may be an important driver of breast cancer inequities for BSMW. Reducing stigma and ensuring access to appropriate social support that addresses known barriers can be an important approach to reducing inequities in the breast cancer care continuum.

"This is some mess right here": Exploring interactions between Black sexual minority women and health care providers for breast cancer screening and care

BACKGROUND

Few studies have explored how the intersection of race and sexual identity contribute to breast cancer disparities for Black sexual minority women (SMW). Issues within patient-provider relationships, including bias, contribute to health disparities for minority groups. The authors used constructs from self-determination theory (SDT) to explore the nature of health care provider interactions in breast cancer screening and care among Black SMW.

METHODS

Participants were sampled nationally through social media, targeted emails, and referrals. Qualitative, in-depth interviews were conducted with 15 Black cisgender SMW, ages 38 to 64 years, who had a breast cancer diagnosis or recent abnormal mammogram. Interviews were conducted face-to-face or online, audio-recorded, and transcribed verbatim. Two analysts coded the interviews. Codes were analyzed across interviews to identify themes salient to SDT.

RESULTS

Themes aligned with the SDT constructs of relatedness and autonomy. Some participants discussed feeling most understood by Black and/or female providers who shared at least 1 of their identities. Feeling understood through shared identity contributed to participants feeling seen and heard by their providers. Participants who discussed negative experiences with providers believed that the provider made negative assumptions about them based on their race and/or sexual orientation.

CONCLUSIONS

When interacting with health care providers for breast cancer screening and care, Black SMW face specific challenges related to their multiply marginalized social position. Reducing health care provider bias toward Black SMW may improve patients' desires to continue in care. Providing equitable care while acknowledging and respecting women with multiply marginalized identities may improve the nature of these interactions.

Sexual Orientation Identity Disparities in Mammography Among White, Black, and Latina U.S. Women

Purpose: Our goal was to examine sexual orientation identity disparities in mammography in relationship to race/ethnicity among U.S. women. Methods: Using nationally representative 2013-2017 National Health Interview Survey data, we used multivariable logistic regression to estimate the odds of receiving a mammogram in the past year in relationship to sexual orientation identity among White, Black, and Latina U.S. women 40-75 years of age (N = 45,031) separately, adjusting for demographic factors. We also assessed whether socioeconomic and health care factors attenuated sexual orientation identity disparities in mammography across racial/ethnic groups. Results: Among White women, bisexual women had significantly lower adjusted odds of mammography compared to heterosexual women (odds ratio = 0.70, 95% confidence interval: 0.50-0.99). Among Black women, the adjusted odds of mammography were significantly higher among bisexual women relative to heterosexual women (2.53, 1.08-5.92). Black lesbian women appeared to have lower adjusted odds of mammography compared to their heterosexual counterparts; however, this difference was not statistically significant (0.80, 0.46-1.38). Similarly, among Latina women, lesbian women also seemed to have lower adjusted odds of mammography relative to heterosexual women, but this disparity was also not statistically significant (0.64, 0.37-1.13). Adding socioeconomic factors completely attenuated the disparity between White bisexual and heterosexual women (0.76, 0.52-1.10). Conclusions: Sexual orientation identity disparities in receiving a mammogram in the past year differed in relationship to race/ethnicity among White, Black, and Latina U.S. women. Additional research with larger samples of Black and Latina lesbian and bisexual women is needed to more accurately estimate and explain observed differences.

What Oncologists Should Know About Treating Sexual and Gender Minority Patients With Cancer

Sexual and gender minority (SGM) individuals encompass a broad spectrum of sexual orientations and gender identities. Although SGM is a research term, this population is often known as lesbian, gay, bisexual, transgender, queer (LGBTQ). Typically, LGB refers to sexual orientation, T refers to gender identity, and Q may refer to either. Although each group is distinct, they share the common bond of experiencing health disparities that may be caused, in part, by stigma and discrimination, as well as by the oncology provider’s lack of knowledge and, therefore, lack of comfort in treating this population. One challenge in improving the quality of care for SGM patients with cancer is the lack of collection of sexual orientation and gender identity (SOGI) data in the medical record. Furthermore, national studies suggest that many oncologists are unsure of what to do with this information, even when it is collected, and some are uncertain as to why they would need to know the SOGI of their patients. This clinical review offers insight into the health disparities experienced by SGM individuals and strategies for improving the clinical encounter and creating a welcoming environment.

The Role of Butch versus Femme Identity in Body Image and Breast Health Among Lesbians in Taiwan: Results of an Online Survey

PURPOSE

The views of butch- and femme-identified lesbians toward their own breasts, breast cancer, breast cancer screenings, and their behavior and intentions toward breast health care were examined and compared in this study.

METHODS

A total of 208 Taiwanese lesbians (134 butch-identified lesbians and 78 femme-identified lesbians) completed an online survey.

RESULTS

Butch-identified lesbians were more likely to hold negative views regarding their own breasts, which were found to be significantly and negatively associated with their actions in performing breast self-examinations when compared with femme-identified lesbians.

CONCLUSIONS

Healthcare providers should be aware of and provide culturally competent care to lesbians with different identities.

CLINICAL RELEVANCE

The results can be employed as evidence for promoting lesbians' breast health, particularly butch-identified lesbians. Healthcare providers should provide a supportive environment in order to promote a positive body image and improve breast health among lesbians.

Breast Cancer in San Francisco: Disentangling Disparities at the Neighborhood Level

BACKGROUND

This study uses a novel geographic approach to summarize the distribution of breast cancer in San Francisco and aims to identify the neighborhoods and racial/ethnic groups that are disproportionately affected by this disease.

METHODS

Nine geographic groupings were newly defined on the basis of racial/ethnic composition and neighborhood socioeconomic status. Distribution of breast cancer cases from the Greater Bay Area Cancer Registry in these zones were examined. Multivariable logistic regression models were used to determine neighborhood associations with stage IIB⁺ breast cancer at diagnosis. Cox proportional hazards regression was used to estimate the hazard ratios for all-cause and breast cancer-specific mortality.

RESULTS

A total of 5,595 invasive primary breast cancers were diagnosed between January 1, 2006 and December 31, 2015. We found neighborhood and racial/ethnic differences in stage of diagnosis, molecular subtype, survival, and mortality. Patients in the Southeast (Bayview/Hunter's Point) and Northeast (Downtown, Civic Center, Chinatown, Nob Hill, Western Addition) areas were more likely to have stage IIB⁺ breast cancer at diagnosis, and those in the East (North Beach, Financial District, South of Market, Mission Bay, Potrero Hill) and Southeast were more likely to be diagnosed with triple-negative breast cancers (TNBC). Compared with other racial/ethnic groups, Blacks/African Americans (B/AA) experienced the greatest disparities in breast cancer-related outcomes across geographic areas.

CONCLUSIONS

San Francisco neighborhoods with lower socioeconomic status and larger minority populations experience worse breast cancer outcomes.

IMPACT

Our findings, which reveal breast cancer disparities at sub-county geographic levels, have implications for population-level health interventions.