Five-year overall survival increased among non-Hispanic Black patients by 2.02% in conjunction with a 10% increase in spending. In addition, there was a decrease in racial disparities in survival between non-Hispanic Black patients and White patients for many types of cancers.
However, public welfare spending had no real impact on the overall 5-year survival for the entire cohort (0.25 % per 10% increase in spending; P = .78) or for non-Hispanic White patients (0.52% per 10% increase in spending, P = .58).
“We know from prior research that outcomes are worse for minorities,” said lead author Justin Michael Barnes, MD, from the department of radiation oncology at Washington University in St. Louis, Mo. “It’s thought that some of the differences are related to impaired access to health care for minorities, which is related to social determinants of health. This includes socioeconomic factors, educational attainment, place of residence, as well as environmental stressors.
“Our data show that greater state welfare expenditures were associated with greater 5-year survival among Black patients and decreased Black–White disparities,” said Dr. Barnes. “I think these data are thought provoking, but they certainly aren’t the end. I see these data as a proof-of-concept project.”
Dr. Barnes reported the findings at a press conference held in advance of the annual meeting of the American Society of Clinical Oncology, during which the study will be presented (Abstract 6509).
Improved 5-year survival in Black patients
For the study, Dr. Barnes and colleagues evaluated the association of 5-year overall survival and public welfare spending in 2,925,550 individuals aged 18 years and older who were diagnosed with cancer during the period 2007-2016. The cohort was drawn from the Surveillance, Epidemiology, and End Results Program. In addition, annual state spending data were obtained from the U.S. Census Bureau. The team examined survival outcomes by race and ethnicity as well as by cancer site. The investigators accounted for factors such as age, sex, metropolitan residence, state, county-level income and education, insurance status, cancer site, stage at diagnosis, and year of diagnosis.
Much of public welfare spending was related to Medicaid but also included programs that provide subsidy assistance for individuals, such as Supplemental Security Income.
As compared with White patients, the 5-year overall survival rate was 10.8% lower among non-Hispanic Black patients. But there was a 4.46% (P for interaction <.001) narrowing of the 5-year overall survival disparity in non-Hispanic Black patients in comparison with White patients per 10% increase in spending, or a 42% closure of the 10.8% disparity.
Regarding specific cancer types, increased public welfare spending was associated with a narrowing of the 5-year overall survival disparity between Black patients and non-Hispanic White patients for the following cancers: breast (a 6.15% survival increase for Black patients led to a 39% closing of the disparity), cervix (a 11.9% survival increase led to a 46% closing of the disparity), colorectum (a 4.42% survival increase led to a 48% closing of the disparity), head and neck (a 9.41% survival increase led to a 38% closing of the disparity), liver (a 7.02% survival increase led to a 49% closing of the disparity), ovary (an 8.95% survival increase led to a 41% closing of the disparity), bladder (an 8.18% survival increase led to a 44% closing of the disparity), and uterus (a 14.1% survival increase led to a 40% closing of the disparity).
“Some type of public welfare seems to be helping improve oncologic outcomes for some of our most socioeconomically at-risk patients, but we don’t know the specifics,” Dr. Barnes concluded. “Additional work is needed to identify the most influential public health expenditures. If we can do this, we can more rigorously evaluate state-level policies and their association with cancer outcomes.”