Racial gaps persist in how breast cancer survivors function and feel during and after treatment
September 20, 2016
An analysis of the quality of life of several thousand breast cancer survivors in North Carolina found differences in how black and white women functioned and felt physically and spiritually during treatment and two years after diagnosis.
The study, led by researchers from the University of North Carolina Lineberger Comprehensive Cancer Center and the UNC Gillings School of Global Public Health, found white women reported higher physical and functional health-related quality of life scores compared with black women during active treatment.
Co-authors of the study included Andrew Olshan, PhD, Barbara Sorenson Hulka Distinguished Professor in Cancer Epidemiology at the Gillings School and associate director of population sciences at UNC Lineberger; senior author Bryce Reeve, PhD, professor of health policy and management at the Gillings School and UNC Lineberger member; and Laura Pinheiro, doctoral candidate in health policy and management at the Gillings School.
The gap in physical quality of life scores narrowed two years after diagnosis, however, and in both physical and functional measures after researchers adjusted the data to account for differences in education, insurance and marital status. The findings suggest that improved socioeconomic conditions could enhance physical and functional quality of life for breast cancer survivors.
Yet, some differences remained. Chiefly, black women had higher spiritual quality of life scores five months and two years after diagnosis than white women, and after adjusting for socioeconomic factors.
“Black women generally had poorer physical and functional quality of life after the diagnosis of breast cancer, and socioeconomic and other factors explain some of these differences,” said Olshan. “However, for some domains, black women report better quality of life.”
The study, published in Breast Cancer Research and Treatment, drew upon surveys that assessed health-related quality-of-life issues for women ages 20 to 74 years who lived in North Carolina and had breast cancer. The analysis is part of the third phase of the Carolina Breast Cancer Study, a study first launched at UNC-Chapel Hill in 1993 as part of an effort to better understand why black women have been found to die disproportionately from breast cancer. Olshan is co-principal investigator of that study.
Researchers used surveys to gauge the physical, functional, emotional and spiritual health-related quality of life of more than 2,100 women at five months after their breast cancer diagnosis, and at 25 months, when women typically have stopped active treatment and have entered the survivorship phase.
For spiritual quality of life, researchers found that black women scored two points higher than white women at five months, when they were in the midst of active treatment, and two years after diagnosis. Specifically, black women scored an average of 41.4 points on spiritual quality of life, while white women scored an average of 39.3 at five months. Two years after diagnosis, black women scored an unadjusted average of 40.5 on spiritual quality of life, while white women had an average score of 38.5. Even after adjusting for socio-economic factors, black women continued to score higher than did white women for spiritual quality of life two years after diagnosis.
“Black women we surveyed had significantly better spiritual wellbeing than did white women, and it was both statistically significant and clinically meaningful,” said co-author Pinheiro.
White women’s average scores for physical and functional quality of life – which track women’s feelings of fatigue, nausea and pain; ability to work and sleep; degree of acceptance of the illness; and ability to enjoy things in normal life – were two to 2.5 points higher than those of black women at five months. The unadjusted average score for white women’s physical health at five months was 20.9, compared to 18.4 for black women. For functional health, white women scored an average of 20.1 compared to 18.2 for black women.
At 25 months after diagnosis, the researchers found that white women still scored higher for physical, social and functional health-related quality of life, but the gap between the unadjusted physical scores for white and black women narrowed, compared to what they had been at five months. Pinheiro said that the findings, in line with previous studies, could suggest that the health-care system may have had a positive impact on the black women’s overall physical health, helping to narrow those gaps.
“As these women enter the health-care system, perhaps some of their other health conditions are better managed,” Pinheiro said. “That is our speculation, and it will merit some additional investigation.”
Researchers also found that, after adjusting for socio-economic factors during survivorship, differences in physical health-related quality of life were diminished.
“Our research suggests that improved social and economic conditions could improve access to care, reduce co-morbid conditions, and other factors that are associated with both the prognosis of breast cancer, quality of life, and the disparities seen between various groups,” Olshan said.
The study demonstrates the importance of the Carolina Breast Cancer Study in understanding how breast cancer and its treatment impacts the lives of North Carolinians, said senior author Reeve.
“We hope to use these findings to uncover opportunities for improving quality of life for women with breast cancer,” Reeve said.
The study was supported by the University Cancer Research Fund of North Carolina, the National Cancer Institute Specialized Program of Research Excellence in Breast Cancer at UNC, the Susan G. Komen for the Cure Foundation and the National Institutes of Health.