A Danish study said to be the largest of its kind finds no association between long-term cellphone use and tumors of the brain and central nervous system.
Researchers from the Danish Cancer Society and the International Agency for Research on Cancer (IARC) reported in the BMJ (British Medical Journal) that they studied more than 358,000 people over 18 years.
The study was funded by the Danish government and did not receive any financial report from the cellphone industry, the researchers said.
With more than 5 billion cellphone subscriptions globally, there has been increasing concern about the longterm health effects of exposure to radiofrequency emissions from the phones.
The Danish study focused on Danes aged at least 30 years who were born in Denmark after 1925. They divided them into two groups, those who had been subscribers since 1995 and people who had a cellphone before 1995.
Among the findings were these:
- 10,729 nervous system tumors were reported from 1990 to 2007.
- Brain and nervous system tumor rates among long-term cellphone users (at least 13 years usage) were nearly the same as for those with no cellphone.
- There was no overall increase of any type of tumor risk for long-term cellphone users, compared to those with no cellphones
The authors cautioned that, while they did not find any higher risks of cancer in the study group, that does not rule out the possbility of greater risk in those exposed to cellphone radiation for even longer periods of time.