according to new data from the St. Jude Lifetime Cohort.
Survivors with a greater number and severity of modifiable chronic health conditions as well as those living in the most versus least resource-deprived areas had a significantly higher risk of all-cause and health-related late death.
Finding ways to mitigate these factors “will be important to improving health outcomes and developing risk-stratification strategies to optimize care delivery to survivors at varying risk of adverse health events,” the researchers wrote.
The study indicates that treating chronic health conditions alone may not be enough to increase a cancer survivor’s lifespan; improving local environments matters too.
“It is important for clinicians to ask patients about their specific situation,” first author Matthew J. Ehrhardt, MD, department of oncology, St. Jude Children’s Research Hospital, Memphis, said in a news release. “It’s easy to prescribe medications or to tell people to exercise. It takes more time and more thoughtfulness to sit and understand environments in which they are residing.”
“As clinicians, we may have limited ability to modify some of those factors. But we can work closely with the rest of the health care team, such as social workers, for example, to help survivors to identify and access local resources,” Dr. Ehrhardt added.
The study was published online in JAMA Network Open.
A growing population of childhood cancer survivors faces an increased risk for premature death in the years following their diagnosis. However, associations between social determinants of health, modifiable health conditions, and late mortality in childhood cancer survivors remain unclear.
To assess late mortality, the study team analyzed data on 9,440 participants (median age at assessment, 27.5 years; range, 5.3-71.9 years) who lived at least 5 years after being diagnosed with a childhood cancer between 1962 and 2012.
During a median follow-up of about 18 years, childhood cancer survivors had an increased rate of both all-cause and health-related late mortality (standardized mortality rate, 7.6 for both). Among specific health-related causes of death, SMRs were 16.0 for subsequent neoplasms, 9.0 for pulmonary causes, 4.2 for cardiac causes, and 4.3 for other health-related causes.
To evaluate ties between modifiable chronic health conditions, social determinants, and late mortality, the researchers restricted their analysis to 3,407 adult study participants for whom relevant data were available. Modifiable chronic health conditions included dyslipidemia, hypertension, diabetes, underweight or obesity, bone mineral deficiency, and hypothyroidism.
After adjusting for individual factors, including age at diagnosis and treatment, as well as neighborhood-level factors, the researchers observed a significantly increased risk for death among survivors with one or more modifiable chronic health conditions of grade 2 or higher (relative risk, 2.2), two chronic health conditions of grade 2 or higher (RR, 2.6) or three chronic health conditions of grade 2 or higher (RR, 3.6).
These findings suggest that “increased late mortality experienced by childhood cancer survivors in adulthood may not be predetermined by treatment-related risk factors alone,” the researchers said.
In addition, survivors living in the most disadvantaged areas, as measured by the area deprivation index (ADI), had a five- to eightfold increased risk of late death from any cause compared with those living in the least disadvantaged areas, even after adjusting for modifiable chronic health conditions, cancer treatment, demographics, and individual socioeconomic factors.
The findings have important public health implications, Dr. Ehrhardt and colleagues said. The results can, for instance, help identify and stratify cancer survivors at higher lifetime risk for specific chronic conditions and late death.
This risk-stratified approach to care, however, is “relatively static” and does not account for risk factors acquired after cancer diagnosis and treatment, such as social determinants of health.
That is why also focusing on socioeconomic factors is important, and transitional care services following cancer treatment should consider that survivors in disadvantaged neighborhoods may lack supportive resources to address health issues, potentially leading to increased risk for death, the researchers said.
The knowledge that living in a resource-poor neighborhood may raise the risk for late death in childhood cancer survivors “strengthens support for public health policies that will direct resources to such regions and facilitate a multipronged approach to risk mitigation,” the authors concluded.
This study was supported by grants from the National Institutes of Health and the American Lebanese Syrian Associated Charities. The authors reported no relevant financial relationships.
A version of this article first appeared on Medscape.com.