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Traumatic Brain Injury and Subsequent Risk of Brain Cancer in US Veterans of the Iraq and Afghanistan Wars
Ian J Stewart1,2, Jeffrey T Howard3,4, Eduard Poltavskiy3
1Department of Medicine, Uniformed Services University of Health Sciences, Bethesda, Maryland.
JAMA Network Open
|February 15, 2024
Summary
Moderate/severe traumatic brain injury (TBI) and penetrating TBI were linked to increased brain cancer risk in veterans. Mild TBI showed no significant association, indicating severity matters for cancer development.
Area of Science:
- Neuroscience and oncology research.
- Epidemiological studies on injury and disease.
- Military health and veteran affairs.
Background:
- Brain cancer has a poor prognosis and few known risk factors.
- Previous studies on traumatic brain injury (TBI) and brain cancer risk are conflicting.
- Further investigation is needed to clarify the TBI-brain cancer association.
Purpose of the Study:
- To investigate the association between traumatic brain injury (TBI) exposure and the risk of developing brain cancer.
- To analyze TBI severity as a potential factor in brain cancer development.
Main Methods:
- Retrospective cohort study using administrative data from Veterans Affairs and Department of Defense.
- Inclusion of 1,919,740 veterans with follow-up up to 7.2 years.
- Categorization of TBI exposure by severity: mild, moderate/severe, and penetrating.
Main Results:
- Moderate/severe TBI was associated with a 1.90-fold increased risk of brain cancer (AHR, 1.90; 95% CI, 1.16-3.12).
- Penetrating TBI was associated with a 3.33-fold increased risk of brain cancer (AHR, 3.33; 95% CI, 1.71-6.49).
- Mild TBI did not show a significant association with increased brain cancer risk (AHR, 1.14; 95% CI, 0.88-1.47).
Conclusions:
- Moderate/severe and penetrating traumatic brain injuries are associated with an increased risk of subsequent brain cancer in veterans.
- Mild TBI is not significantly associated with brain cancer risk.
- Findings highlight the importance of TBI severity in understanding cancer development.
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