Cell phones cause cancer in rats, echoing earlier findings in human studies: preliminary results from a large US government study.

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Male rats exposed to cellphone radiation in a large U.S. government study were more likely to develop rare brain and heart cancers, a preliminary analysis has found, adding weight to concerns the ubiquitous devices could pose a health risk to people.

Though the study is the most comprehensive yet of lab animals exposed to cellphone radiation, researchers say it's far from conclusive.

It's not clear why cancer rates rose in male but not female rats or why rats exposed to cellphone radiation lived, on average, longer than radiation-free rats.

The agency says it would then "Determine what, if any, impact this study has on the agency's thinking about any risks" tied to cellphone radiation.

In Chicago, Illinois, scientists built 21 special "Reverberation" rooms designed to evenly distribute the radiation produced by cellphones to caged rats and mice over a 2-year period.

In 2011, the World Health Organization's International Agency for Research on Cancer declared the kind of radiation emitted by cellphones a "Possible carcinogen," based partly on the epidemiological studies that found potential links to gliomas and acoustic neuromas.

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