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Comparative Effectiveness of Digital Breast Tomosynthesis and Mammography in Older Women

Abstract

Background

Digital breast tomosynthesis (DBT) has become a prevalent mode of breast cancer screening in recent years. Although older women are commonly screened for breast cancer, little is known about screening outcomes using DBT among older women.

Objective

To assess proximal screening outcomes with DBT compared to traditional two-dimensional(2-D) mammography among women 67–74 and women 75 and older.

Design

Cohort study.

Participants

Medicare fee-for-service beneficiaries aged 67 years and older with no history of prior cancer who received a screening mammogram in 2015.

Main Measures

Use of subsequent imaging (ultrasound and diagnostic mammography) as an indication of recall, breast cancer detection, and characteristics of breast cancer at the time of diagnosis. Analyses used weighted logistic regression to adjust for potential confounders.

Key Results

Our study included 26,406 women aged 67–74 and 17,001 women 75 and older who were screened for breast cancer. Among women 75 and older, the rate of subsequent imaging among women screened with DBT did not differ significantly from 2-D mammography (91.8 versus 97.0 per 1,000 screening mammograms, p=0.37). In this age group, DBT was associated with 2.1 additional cancers detected per 1,000 screening mammograms compared to 2D (11.5 versus 9.4, p=0.003), though these additional cancers were almost exclusively in situ and stage I invasive cancers. For women 67–74 years old, DBT was associated with a higher rate of subsequent imaging than 2-D mammography (113.9 versus 100.3, p=0.004) and a higher rate of stage I invasive cancer detection (4.7 versus 3.7, p=0.002), but not other stages.

Conclusions

Breast cancer screening with DBT was not associated with lower rates of subsequent imaging among older women. Most additional cancers detected with DBT were early stage. Whether detecting these additional early-stage cancers among older women improves health outcomes remains uncertain.

INTRODUCTION

Prior to 2011, two-dimensional(2-D) digital mammography was the standard of care for breast cancer screening. In 2011, digital breast tomosynthesis (DBT), an imaging modality that generates 3-dimensional tomographic images of the breast, was FDA-approved and has since been widely adopted. In one recent study, DBT was used in over 40% of screening examinations, and as of January 2021, nearly 75% of certified breast imaging facilities in the USA have DBT units.1,2 Several observational studies have demonstrated that women screened with DBT are less likely to be called back for additional diagnostic imaging compared to women screened with 2-D mammography, a measure known as recall.3,4,5,6,7 Other studies have shown higher cancer detection rates when DBT is used over 2-D mammography.8,9,10,11,12,13

Some studies have examined screening outcomes using DBT compared to 2-D mammography specifically among older women. One recent study found that among women over the age of 65, DBT had a lower abnormal interpretation rate, a higher specificity, and a similar cancer detection rate compared with 2-D mammography.14 A second study reported lower recall rates with DBT among women 70 and older.15 However, neither study reported outcomes among women 75 and older. This age group is of particular interest because mammography itself is of uncertain benefit for women over the age of 74. No randomized trials of mammography have included women over 74, and a recent study found no difference in 8-year breast cancer mortality between women over 75 who received annual 2-D screening mammography and those who did not.16 The US Preventive Services Task Force guidelines give screening among women 75 and older an “I” rating, indicating that there is insufficient evidence for or against screening.17,18 Despite the dearth of evidence for effectiveness in older women, more than 50% of women over the age of 75 continue to receive screening mammography.16 Whether or not to deploy DBT—a newer, more expensive technology—in this age group is unclear.

Given ongoing uncertainty about the effectiveness of DBT for screening among older women, the goal of this study was to evaluate proximal screening outcomes, including subsequent imaging use and biopsy rates, cancer detection rates, and characteristics of detected cancers, for older women who were screened with 2-D mammography and DBT. Our study focused on screening outcomes among women 75 and older but also evaluated outcomes among women 67–74 as an important comparison group.

METHODS

Data Source

We used data from the Surveillance, Epidemiology, and End Results Program-Medicare linked database (SEER-Medicare). SEER-Medicare integrates Medicare claims with data on cancer diagnosis for patients enrolled in the SEER registry. We used two samples to construct the study cohort: (1) the SEER cancer sample, which includes all Medicare beneficiaries reported to SEER with a diagnosis of breast cancer through calendar year 2015, and (2) the SEER “non-cancer” sample, a 5% representative sample of Medicare beneficiaries living in SEER regions who have not been diagnosed with cancer through the end of available follow-up. We combined these samples, weighting the non-cancer sample 20:1 to balance the differential sampling between the cancer sample, which includes all cases, and the non-cancer sample, which is a 5% sample. This approach constructs a representative population of Medicare beneficiaries residing in SEER areas in 2015.19 The Yale Human Investigation Committee determined that this study did not constitute human subjects research.

Study sample

Among women continuously enrolled in Medicare Fee for Service parts A & B from January 1, 2013, to December 31, 2016, we identified women aged 67 and older who received a screening mammogram between January 1 and December 31, 2015, the first year that DBT was covered in the Medicare program. We excluded women who had a history of breast cancer or other cancers prior to screening mammography, based on either SEER data or Medicare claims. We also excluded women with genetic cancer syndromes and women who underwent prophylactic mastectomy prior to mammography (eTable 1). Finally, we excluded women whose cancer was identified by death certificate or autopsy or had missing diagnosis dates within SEER. For analyses focusing on cancer diagnosis, we included women screened between January 1, 2015, and August 31, 2015, rather than the full calendar year. This was to allow for 4 months of follow-up in 2015 during which we could observe cancer diagnoses after screening.

Variables

The primary predictor of interest was use of 2-D mammography or DBT for breast cancer screening. 2-D mammography was defined as screening with film or full-field digital mammography, with or without computer-aided detection. We identified 2-D screening mammograms using a validated algorithm which we adapted for use with codes from the 10th revision of the International Statistical Classification of Diseases and Related Health Problems (ICD-10) (eMethods).20 DBT is typically performed and billed in conjunction with 2-D mammography for women enrolled in Medicare. Therefore, we defined screening DBT as receipt of a 2-D screening mammogram, as defined by the algorithm, in conjunction with a claim for screening DBT (eTable 1).

Women screened with DBT may have important clinical and demographic differences from women screened with 2-D. Thus, we compared patient characteristics including age, race, eligibility for state-sponsored insurance (e.g., Medicaid programs), previous breast cancer screening history, family history of breast cancer, and comorbidities by screening type (DBT or 2-D).21 Of note, women of Hispanic ethnicity are included in all categories of race. Covariates were identified from SEER data and from claims. We used data on neighborhood poverty from the American Community Survey 2008–2012 aggregated at the zip code level as a proxy for individual income.22

We evaluated downstream testing including imaging and biopsy after screening DBT or 2-D mammography among women screened between January 1, 2015, and December 31, 2015. We defined “subsequent imaging” as the presence of a claim for diagnostic mammography, with or without DBT, or unilateral or focused breast ultrasound, conducted in the 4 months after the index mammogram. This definition is intended to capture women who return for follow-up imaging after an abnormal mammogram. We considered bilateral whole breast ultrasound to be likely screening and reported it separately as a covariate. We also evaluated use of MRI and biopsy after DBT and 2-D mammography, but did not include MRI within our definition of subsequent imaging, as MRI is often used either to screen high-risk women or to evaluate a newly diagnosed breast cancer.

We evaluated cancer diagnoses among the subset of women screened between January 1, 2015, and August 31, 2015. This period was chosen to allow 4 months of follow-up to assess for the presence of a cancer diagnosis after breast cancer screening, since the most current data at the time of study included data on cancer diagnoses only through December 31, 2015. We defined screen-detected cancer diagnosis as any breast cancer diagnosis, including carcinoma in situ, within 4 months of a screening mammogram. We evaluated stage at diagnosis as defined by the 6th edition of the AJCC staging system and tumor size.23 Using a previously established classification system, we also grouped tumors into three prognostic categories: biologically favorable, intermediate, or unfavorable based on tumor grade and hormone receptor status (eTable 2).24 For consistency, we also assessed imaging and biopsy outcomes in the subset of women screened between January 1, 2015, and August 31, 2015, i.e., the subset of women for whom we were also able to evaluate cancer diagnoses.

Lastly, we calculated positive predictive values following subsequent imaging and biopsy, defined as the proportion of women diagnosed with cancer from among those who underwent subsequent imaging or biopsy after an initial screening exam. Procedure codes used to define imaging and testing outcomes are detailed in eTable 1.

Statistical Analysis

We stratified all analyses by two age groups, 67–74 and over 75, to assess for differences in outcomes between the younger age group, for which data support the use of screening mammography, and the older age group, where benefit is less clear. We also stratified analyses by quarter to evaluate screening outcomes over time. We used weighted chi-square tests to evaluate the differences in clinical and demographic characteristics between women screened with DBT and 2-D mammography. We used weighted logistic regression to evaluate the relationship between screening type and subsequent testing. For cancer stage, tumor size, and biologic category, we used weighted multinomial logistic regression to account for multiple outcome categories. Analyses were adjusted for age, race, Elixhauser comorbidity score, family history of breast cancer, number of screening mammograms in 2013–2014, dual eligibility, SEER area, and zip code-level prevalence of poverty. We also adjusted for influenza vaccination and PCP visits as markers of a patient’s use of preventive services and access to care overall, which could confound their use of DBT and use of downstream imaging. Lastly, we adjusted for use of screening ultrasound (defined as bilateral, whole breast ultrasound), as it may be a marker of risk and may also affect screening outcomes. Models used robust standard errors, clustered by SEER area. We used predicted probabilities calculated at observed values to express adjusted outcomes per 1,000 women screened.

RESULTS

Our final sample included 26,406 women ages 67–74 and 17,001 women ages 75 and older who were screened for breast cancer during 2015, representing a weighted population size of 754,568 (eTable 3). Overall, 79% of women received 2-D mammography and 21% received DBT, with use of DBT increasing over time (eFigure 1). Among women 75 and older, DBT use was more common in wealthier zip codes (26% in the wealthiest zip codes versus 14% in the poorest zip codes, p<0.001) and less common among Black versus White women (14% versus 21%, respectively, p < 0.001). Women with eligibility for state-sponsored health coverage were also less likely to receive DBT than those with Medicare only (12% versus 21%, p < 0.001). Patterns of DBT use were generally similar among women aged 67–74(Table 1).

Table 1 Clinical and Demographic Characteristics of Women Screened with 2-D Mammography Versus DBT

For women 75 and older, adjusted rates of subsequent imaging were not significantly different between those screened with DBT and 2-D mammography (91.8 versus 97.0 per 1,000 mammograms with DBT versus 2-D, p=0.37; Table 2). By contrast, for women aged 67–74, adjusted rates of subsequent imaging were higher following DBT than following 2-D mammography (113.9 versus 100.3 women with subsequent imaging per 1,000 mammograms, p=0.004; Table 2). In both age groups, point estimates for subsequent imaging among women screened with DBT were highest in the first quarter of the year and declined over time (eTable 4a, eFigure 2a). Congruent with this finding, in the subset of women screened between January and August 2015, unadjusted subsequent imaging rates were higher with DBT, both for women 67–74 (120.4 versus 99.6 per 1000, p=0.001) and for women 75 and older (109.7 versus 93.3, p=0.03) (eTable 5).

Table 2 Follow-up Imaging and Testing Rates for Women Screened with 2-D Mammography Versus DBT, per 1,000 Women Screened

Among women 75 and older, adjusted biopsy rates were not significantly different between women screened with DBT and those screened with 2-D mammography (18.9 versus 16.8 per 1,000 mammograms, p=0.30; Table 2). Among women 67–74, biopsy rates were higher among women screened with DBT (21.9 versus 16.1 per 1,000 mammograms, p<0.001; Table 2).

We evaluated rates of cancer detection in the subset of women screened between January 1st and August 31st, 2015 (n= 28,626), representing a weighted population size of 490,307. Among women 75 and older, DBT was associated with a higher overall rate of cancer detection compared to 2-D mammography (11.5 versus 9.4 cancers per 1,000 mammograms, p=0.003; Table 3) after adjusting for covariates. Women screened with DBT were more likely to be diagnosed with an in situ neoplasm (2.5 versus 1.5 per 1,000 mammograms, p<0.001; Table 3) or an invasive stage I cancer (6.0 versus 4.9 per 1,000 mammograms, p=0.013; Table 3), but not a more advanced cancer. In contrast, for women 67–74, the adjusted overall cancer detection rate was not significantly different between women screened with DBT versus 2-D mammography (8.1 versus 7.3 per 1,000 mammograms, p=0.056; Table 3). However, DBT was associated with a higher rate of invasive stage I cancer detection (4.7 versus 3.7 per 1,000 mammograms, p=0.002). Unadjusted cancer detection rates were similar to adjusted rates (eTable 6). Point estimates for cancer detection were generally stable over time (eTable 4b, eFigure 2b).

Table 3 Cancer Detection Rates from SEER for Women Screened with 2-D Versus DBT, per 1,000 Women Screened

Among women 75 and older, there were no significant differences in biological features of cancers detected among women screened with DBT versus 2-D mammography (Table 3). Among women 67–74, DBT was associated with a higher cancer detection rate for cancers with favorable biologic features (2.1 versus 1.7 per 1,000 mammograms, p=0.036), but not intermediate or unfavorable biologic features (Table 3).

Among women 75 and older, positive predictive values after subsequent imaging or biopsy for DBT were not statistically different from those for 2-D mammography (10.8% versus 9.7% for subsequent imaging, p=0.26; 50.6% versus 53.6% for biopsy, p=0.66; Table 3). We observed similar results for positive predictive values of subsequent imaging and biopsy among women 67–74 years old (Table 3).

DISCUSSION

In this study comparing short-term breast cancer screening outcomes among older women screened with DBT or 2-D mammography, we found that DBT was not associated with lower subsequent imaging rates compared to 2-D mammography but was associated with higher rates of early-stage breast cancer diagnosis.

Our findings differ from several studies which have shown that DBT is associated with lower recall rates compared to 2-D screening mammography.5,6,8 Lower recall has been held up as a major advantage of DBT, as further workup creates additional anxiety and expense. We have shown that DBT is not associated with use of less subsequent imaging among older women, suggesting that this potential advantage has not been realized in this group.

There are several reasons that may account for the difference between our findings and some prior studies. First, we evaluated DBT at a time when the technology was still relatively new. Indeed, consistent with other studies, we found that the point estimates for subsequent imaging rates among women screened with DBT declined over the course of a calendar year, suggesting some improvement in performance over time.3 Longer periods of follow-up will be needed to fully characterize DBT performance among older women.

A second possible explanation is that DBT affords less of an advantage over 2-D mammography in older women. The performance of 2-D mammography itself improves with age and some studies have suggested a larger absolute reduction in recall with DBT among younger women compared to older women.25,5,15 However, not all studies have shown consistent age effects, and there are important remaining questions about how age, breast density, and screening round may all impact DBT performance among older women.26

Consistent with prior studies, we observed that DBT was associated with higher rates of cancer detection compared to 2-D mammography.8,9,10,11,12 Additional cancers detected were uniformly small, early-stage cancers. Among women 75 and older, DBT was also associated with higher rates of in situ diagnosis, and among women 67–74, DBT was associated with a higher rate of detection of biologically favorable cancers.

Although no long-term studies have evaluated whether the higher cancer detection rate observed with DBT improves mortality, several studies have projected long-term benefits of DBT using simulation modeling. These studies suggest that DBT may avert approximately one additional breast cancer death for every 2000–5000 women screened for at least 10 years, compared to 2-D mammography. However, these studies focus on younger populations and women with dense breasts.27,28 Among older women, the higher cancer detection rate of DBT is of uncertain benefit. Diagnosis of early-stage or in situ breast cancer has not been shown to improve life expectancy among older women and it is not clear whether DBT’s higher cancer detection rate will ultimately improve outcomes for older women.29,30 In addition, increased cancer detection may contribute to harm from overdiagnosis and overtreatment. Thus, as we use more sensitive technologies for breast cancer screening, we will need better data to understand whether older women benefit and alternate approaches to managing lower risk cancers to avoid harm from overtreatment in older women.

We acknowledge several limitations of this study. First, though we adjusted for potential confounders in our analysis, there may be other unmeasured differences between women who received DBT and 2-D mammography that contribute to our findings. In particular, higher-risk women or women with dense breasts may be preferentially referred for DBT, which may result in greater use of subsequent imaging and higher cancer detection rates. While we were unable to observe mammographic findings including breast density, we adjusted for age, which is strongly associated with breast cancer risk and breast density, as well as use of supplemental ultrasound, which may be more commonly used among women with dense breasts. Importantly, the incremental increase in cancer detection that we observed with DBT was similar in magnitude to what has been observed in studies able to adjust for breast density, supporting our findings.5

Second, we used claims-based definitions of some variables, which have limitations. We modified a validated algorithm designed to distinguish screening mammograms from diagnostic mammograms. While our changes replaced outdated ICD-9 codes with their equivalent ICD-10 and CPT/HCPCS codes, these modifications were not themselves validated. We also acknowledge possible limitations in evaluating subsequent imaging. Because we used claims data, we could not observe mammographic results including BIRADS classification and thus could not evaluate recall directly. However, we believe that even if use of subsequent imaging is not a perfect marker of recall, it is an important outcome in itself, as returning for follow-up imaging results in additional time, expense, and anxiety for screened women.

CONCLUSIONS

In summary, in this study of older women undergoing breast cancer screening, DBT was associated with similar or higher rates of subsequent imaging compared to 2-D mammography. While DBT was associated with higher cancer detection rates, the additional cancers detected were mostly early-stage or in situ tumors. Understanding the long-term outcomes and value of DBT in older women will help guide future recommendations for screening in this population.

Data Availability

The SEER-Medicare datasets used for this study are available to researchers at https://healthcaredelivery.cancer.gov/seermedicare/obtain/.

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Acknowledgements

All contributors to this manuscript met the criteria for authorship.

Funding

This work was supported by NIH/NCATS KL2 TR001862 (Richman), NIH/NCI K08 CA238725 (Richman), NIH T35 AG049685-04 (Upneja), and American Cancer Society RSGI-15-151-01 (Gross, Busch, and Xu). Drs. Richman and Kyanko report salary support from the Centers for Medicare and Medicaid Services to develop health care quality measures outside of the submitted work. Dr. Gross reports research grants from NCCN/Pfizer AstraZeneca, Johnson & Johnson, and Genentech, and travel funding from Flatiron Health. Ms. Kunst reports funding from the Research Council of Norway and LINK Medical Research (grant numbers 276146 and 304034) during the conduct of the study, and personal fees for speaking from Thermo Fisher Scientific. Professor Busch reports research funding from NIDA, NIMH, and the Robert Wood Johnson Foundation. NIH was not involved in the study’s design, conduct, or reporting. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. The collection of the California cancer incidence data used in this study was supported by the California Department of Public Health as part of the statewide cancer reporting program mandated by California Health and Safety Code Section 103885; the National Cancer Institute’s Surveillance, Epidemiology and End Results Program under contract N01-PC-35136 awarded to the Northern California Cancer Center, contract N01-PC-35139 awarded to the University of Southern California, and contract N02-PC-15105 awarded to the Public Health Institute; and the Centers for Disease Control and Prevention’s National Program of Cancer Registries, under agreement #U55/CCR921930-02 awarded to the Public Health Institute. The ideas and opinions expressed herein are those of the author(s) and endorsement by the State of California Department of Public Health, the National Cancer Institute, and the Centers for Disease Control and Prevention or their Contractors and Subcontractors is not intended nor should be inferred. The authors acknowledge the efforts of the Applied Research Program, NCI; the Office of Research, Development and Information, CMS; Information Management Services (IMS), Inc.; and the Surveillance, Epidemiology, and End Results (SEER) Program tumor registries in the creation of the SEER-Medicare database. The interpretation and reporting of the SEER-Medicare data are the sole responsibility of the authors.

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Upneja, A., Long, J.B., Aminawung, J.A. et al. Comparative Effectiveness of Digital Breast Tomosynthesis and Mammography in Older Women. J GEN INTERN MED 37, 1870–1876 (2022). https://doi.org/10.1007/s11606-021-07132-6

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KEY WORDS

  • comparative effectiveness
  • digital breast tomosynthesis
  • mammography
  • breast cancer
  • older women