Danish cohort study of mobile subscribers (2011 update)
A nationwide cohort using subscription records rather than recall found no elevated brain tumour incidence among long-term subscribers, including those with 13 or more years of subscription.
Last verified 12 August 2026.
- Authors
- Frei P, Poulsen AH, Johansen C, et al.
- Year
- 2011
- Design
- cohort
- Exposure studied
- Mobile phone subscription duration from operator records, Danish population
- Place in the evidence base
- high
- Primary document
- https://www.bmj.com/content/343/bmj.d6387
Finding
No increased risk of tumours of the central nervous system among long-term subscribers.
What it cannot establish
Subscription is a crude proxy for use: corporate subscriptions were excluded and non-subscribing users misclassified, both of which dilute any true effect. No data on call time or on which side of the head was used.
Related records
- INTERPHONE international case–control study (2010)
The largest case–control study of mobile phone use and brain tumours found no overall increase in glioma or meningioma, with a raised glioma odds ratio confined to the highest decile of reported call time.
Research record
Sources
- danish-cohort-2011 Use of mobile phones and risk of brain tumours: update of Danish cohort study — BMJ, 2011. peer-reviewed, link checked 2026-08-12.
Same record, other formats