Katie Couric says she's been diagnosed with breast cancer

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 and she's sharing her story as a teachable moment 

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Couric says she was diagnosed the first day of summer and had her final radiation treatment yesterday

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the former Network anchor was tested for colon cancer on the Today Show in 2000

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after losing her husband to the disease her sister 

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then died of pancreatic cancer just a few years later 

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Couric says she hopes to encourage women to get their annual mammograms

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