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Head injury as a risk factor for brain tumors in children: results from a multicenter case-control study
J G Gurney1, S Preston-Martin, A M McDaniel
1Karmanos Cancer Institute, School of Medicine, Wayne State University, Detroit, MI, USA.
Insights
Head injury in children may slightly increase brain tumor risk, especially with medical attention or severe injury. Birth injuries combined with head trauma showed a higher risk, but overall evidence remains weak.
Area of Science:
- Pediatric Oncology
- Neuroscience
- Epidemiology
Background:
- Head injuries are common in children, and their potential link to brain tumor development requires investigation.
- Previous studies on head trauma and childhood brain tumors have yielded inconsistent results.
- Understanding risk factors for pediatric brain tumors is crucial for prevention and early detection.
Purpose of the Study:
- To investigate the association between previous head injury and the risk of primary brain tumors in children.
- To explore whether the severity of head injury (e.g., loss of consciousness, hospitalization) modifies this risk.
- To examine the combined effect of birth-related injuries and subsequent head trauma on brain tumor occurrence.
Main Methods:
- A population-based case-control study was conducted.
- Included 540 children diagnosed with a primary brain tumor (cases) and 801 control children.
- Data on previous head injuries, birth injuries, and forceps delivery were collected and analyzed using odds ratios (OR) and 95% confidence limits (CL).
Main Results:
- A slight elevation in brain tumor risk was observed for children with head injuries requiring medical attention (OR = 1.4).
- The risk was stronger for head injuries involving loss of consciousness (OR = 1.6) or hospital admission (OR = 1.7).
- No significant association was found between brain tumors and birth injuries or forceps delivery alone, but a combined history of birth injury and subsequent head injury showed a twofold increased risk (OR = 2.6).
Conclusions:
- The study provides weak evidence supporting head injury as an etiological factor for childhood brain tumors.
- The association appears stronger with more severe head injuries.
- Combined birth and head injuries may increase risk, warranting further research into specific injury mechanisms.
Abstract:
We evaluated the risk of brain tumor occurrence in relation to previous head injury in a population-based case-control study of 540 children with a primary brain tumor and 801 control children. The risk of a brain tumor among children with a previous head injury that resulted in medical attention was slightly elevated when compared with children with no reported head injury [odds ratio (OR) = 1.4; 95% confidence limits (CL) = 1.0, 1.9]. This effect was stronger when we restricted the head-injured group to the few children with loss of consciousness (OR = 1.6; 95% CL = 0.6, 3.9) or an overnight admission to a hospital (OR = 1.7; 95% CL 0.7, 4.6), relative to those with no head injury. We observed no appreciable association between brain tumor occurrence and birth injury involving the head or a forceps delivery. Among the few children with either a birth injury or forceps delivery and a subsequent head injury, we observed approximately twofold elevations in risk. The OR was 2.6 (95% CL = 1.1, 6.9) for those with a birth injury and subsequent head injury, relative to those with neither a birth injury nor head injury. Our results provide only weak evidence in support of head injury as an etiologic agent for brain tumor occurrence in children, although most of our exposed group had only mild head injury.