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Their assessment, published in the prestigious journal of the American Medical Association finds that current screening for breast and prostate cancers have not significantly reduced the death toll and can do more harm than good.
The authors found current screenings often don't detect the most aggressive cancers early, they expose healthy patients to risky treatments and cost a lot of money.
The American Cancer Society says the research has them rethinking their message.
The group says they may soon begin warning people that screening for breast and prostate cancers can come with a real risk of over treating small cancers while missing cancers that are deadly.
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