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Page last updated at 06:04 GMT, Friday, 10 July 2009 07:04 UK

Third of breast cancers 'harmless'

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One in three breast cancers detected by mammogram screening may actually be harmless, a study has suggested.

Data from five countries suggests some women may have had unnecessary treatment for cancers that were unlikely to kill them or spread.

But advocates of screening insist it is a vital tool for early detection of cancerous cells.

Rachel Harvey reports.

READ MORE: Third of breast cancer 'harmless'
READ MORE: Common cancer deaths 'falling'

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