Poor medication adherence is a leading cause of preventable morbidity and mortality, and patients of low socioeconomic status (SES) are up to 65% more likely to be non-adherent. Breast cancer patients living in high SES areas have 84% five-year survival compared with 68% for low SES, and there are large SES-based differences in breast cancer treatment, particularly use and adherence to hormonal therapy (HT), that likely contribute to these survival differences. In this proposal, we seek to investigate mechanisms for the differences in HT adherence, focusing on potentially remediable health delivery issues. Specifically, we aim to 1) Examine the extent of SES disparities in adherence to oral hormonal breast cancer therapies, and their association with mortality disparities among an all-age, national cohort of women with incident breast cancer, 2) Decompose potential mechanisms (ability to pay, medication complexity, and pharmacy accessibility) of adherence disparities and 3) Simulate the effect of alternative care strategies and policies on HT adherence, breast cancer mortality and SES disparities therein.
These aims will be carried out by analyzing a contemporary cohort of women with incident breast cancer identified from the Optum U.S. dataset, which contains sociodemographic, economic (including net worth), medical, and pharmaceutical information for over 35 million patients covered by private and public insurance, which we will link to pharmacy distance measures. We will begin by examining the relationship between measures of SES, adherence and mortality, and then seek to apportion the SES disparities in adherence according to the contribution of each potential factor (or set of factors), using the Oaxaca-Blinder regression-based decomposition approach. Finally, having quantified the net contribution of each factor on SES-specific adherence and differentials therein, we will use parameter estimates generated in Aim 1 to simulate the anticipated effect of alternative policies or interventions (changing subsidy thresholds, improving refill synchronization) in reducing disparities in breast cancer treatment and outcomes. Our goal is to provide policymakers, plan administrators, researchers and advocacy societies with an improved understanding of the health delivery factors that might explain SES disparities in breast cancer outcomes, with an eye to developing effective strategies to eliminate them. By focusing on the experience of a large and diverse cohort of breast cancer patients of all ages, this study will address an important and timely issue, and directly inform efforts to determine how best to allocate resources in cancer as well as other chronic conditions in order to obtain the greatest value and equity.

Public Health Relevance

Through its research into experience of over 6,500 breast cancer patients with breast cancer, this study will provide new information about the effects of a number of barriers to care upon inequities. We will examine whether and by how much patients' ability to pay, medication complexity, and distance to pharmacies affects their use of outpatient cancer therapy pills. We will examine these all together to understand their relative importance, and finally, estimate how much different policy strategies to reduce the barriers could reduce their risk of dying.

Agency
National Institute of Health (NIH)
Institute
National Institute on Minority Health and Health Disparities (NIMHD)
Type
Research Project (R01)
Project #
1R01MD010728-01
Application #
9153150
Study Section
Health Disparities and Equity Promotion Study Section (HDEP)
Program Officer
Zhang, Xinzhi
Project Start
2016-08-11
Project End
2020-04-30
Budget Start
2016-08-11
Budget End
2017-04-30
Support Year
1
Fiscal Year
2016
Total Cost
$653,285
Indirect Cost
$225,235
Name
Medical College of Wisconsin
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
937639060
City
Milwaukee
State
WI
Country
United States
Zip Code
53226
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