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Breast cancer screening guidelines based on flawed Canadian study, new paper says

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  • Breast cancer screening guidelines based on flawed Canadian study, new paper says

    Source: https://www.cbc.ca/news/canada/ottaw...laws-1.6066337

    Breast cancer screening guidelines based on flawed Canadian study, new paper says
    Study seen as contentious in medical community since it was published in the 1990s
    Nicole Williams · CBC · Posted: Nov 23, 2021 4:00 AM ET | Last Updated: 6 hours ago

    A new paper calls into question a decades-old Canadian study that has informed breast cancer screening guidelines for women in their 40s around the world, which generally do not recommend a yearly mammogram.

    The commentary — co-written by researchers at The Ottawa Hospital, Sunnybrook Research Institute in Toronto, the University of British Columbia, the University of Alberta and Harvard Medical School — will be published inthe Journal of Medical Screening this week.

    It specifically points to randomization issues with the Canadian National Breast Screening Study (CNBSS), originally conducted in the 1980s, which involved tens of thousands of women and eventually took place in 15 different urban centres across the country...


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