In a study looking at almost 7,000 children and patterns of early childhood cancers across Britain, the researchers found that those who developed cancer before the age of five were no more likely to have been born close to a mast than their peers.

"These results are reassuring," said Paul Elliot, director of the center for environment and health at Imperial College London, who worked on the study.

"We found no pattern to suggest that the children of mums living near a base station during pregnancy had a greater risk of developing cancer than those who lived elsewhere."

Use of cell phones has increased dramatically in recent years and questions have been raised about possible health effects, including whether they may be linked to brain tumors or other cancers.

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