Senator McCaskill discusses battling breast cancer

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(KTVI) - When Senator Claire McCaskill announced she had breast cancer last February on Tumblr, a social media website, she was overwhelmed by the outpouring support she received from family, friends, constituents and strangers. The lump in her breast was discovered during a regular mammogram. McCaskill was treated at the renowned Siteman Cancer Center in St. Louis. She returned to work in Washington D.C. after receiving three weeks of radiation treatments, which were covered by the health insurance she pays for herself. McCaskill says her prognosis is good and she feels good.