This study demonstrates a very linear relationship between cell phone usage and brain tumor incidence which needs further epidemiological evaluation. The authors note it would be prudent to limit exposure to all sources of electromagnetic radiation.

PMID: 

J Neurooncol. 2011 Feb ;101(3):505-7. Epub 2010 Jun 30. PMID: 20589524

Abstract Title: 

Association between number of cell phone contracts and brain tumor incidence in nineteen U.S. States.

Abstract: 

Some concern has arisen about adverse health effects of cell phones, especially the possibility that the low power microwave-frequency signal transmitted by the antennas on handsets might cause brain tumors or accelerate the growth of subclinical tumors. We analyzed data from the Statistical Report: Primary Brain Tumors in the United States, 2000-2004 and 2007 cell phone subscription data from the Governing State and Local Sourcebook. There was a significant correlation between number of cell phone subscriptions and brain tumors in nineteen US states (r = 0.950, P

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