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WEBINAR - What Canadians Should Know About the Canadian National Breast Screening Studies

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1. The Canadian National Breast Screening Studies (CNBSS) are major outliers among the randomized, controlled trials of screening (which are the only way to prove that screening saves lives). Contrary to the other randomized, controlled trials (RCTs) which proved a benefit from screening women ages 40-74 (the ages of the women who participated) the CNBSS showed no benefit from screening for women at any age.
2. From the beginning there have been questions about how the trial was performed.
a. Their own review showed that the quality of the mammography was "poor to unacceptable" for much of the trials.
b. They violated the fundamental rules for RCTs by examining all of the women prior to assigning them to the study arms or the control arms and then assigned women on open lists - another major violation. This provided the opportunity to assign women out of random order and "load" the screening side with women with advanced cancers, biasing the results.
c. The data have always suggested an assignment imbalance. A technologist in the trial recently confirmed that this happened. By corrupting random assignment, the results of the CNBSS become unreliable.
3. The results of the CNBSS should not be used to guide screening which has been proven to save lives for women ages 40-74.

About the presenter:
Daniel B. Kopans, MD, is the founder of the Breast Imaging Division of the Massachusetts General Hospital (MGH) and a Professor of Radiology at the Harvard
Medical School. He is an internationally recognized expert in breast cancer detection and diagnosis.

Basing his arguments on science and evidence, Dr. Kopans has been a champion of breast cancer screening and has been a major factor in preserving access for women ages 40-74 to early detection with lifesaving results.

View the YouTube video: https://youtu.be/eiDwxuiqqvo

To learn more about CCSN, visit us at survivornet.ca
Follow CCSN on social media:
Twitter - https://twitter.com/survivornetca
Facebook - https://www.facebook.com/CanadianSurvivorNet
Instagram: https://www.instagram.com/survivornet_ca/
Pinterest - https://www.pinterest.com/survivornetwork

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WEBINAR - What Canadians Should Know About the Canadian National Breast Screening Studies

  1. 1. Canadian Cancer Survivor Network Contact Info 1750 Courtwood Crescent, Suite 210 Ottawa, ON K2C 2B5 Telephone / Téléphone : 613-898-1871 E-mail: jmanthorne@survivornet.ca or info@survivornet.ca Website: www.survivornet.ca Twitter: @survivornetca Facebook: www.facebook.com/CanadianSurvivorNet Instagram: @survivornet_ca Pinterest: http://pinterest.com/survivornetwork/

1. The Canadian National Breast Screening Studies (CNBSS) are major outliers among the randomized, controlled trials of screening (which are the only way to prove that screening saves lives). Contrary to the other randomized, controlled trials (RCTs) which proved a benefit from screening women ages 40-74 (the ages of the women who participated) the CNBSS showed no benefit from screening for women at any age. 2. From the beginning there have been questions about how the trial was performed. a. Their own review showed that the quality of the mammography was "poor to unacceptable" for much of the trials. b. They violated the fundamental rules for RCTs by examining all of the women prior to assigning them to the study arms or the control arms and then assigned women on open lists - another major violation. This provided the opportunity to assign women out of random order and "load" the screening side with women with advanced cancers, biasing the results. c. The data have always suggested an assignment imbalance. A technologist in the trial recently confirmed that this happened. By corrupting random assignment, the results of the CNBSS become unreliable. 3. The results of the CNBSS should not be used to guide screening which has been proven to save lives for women ages 40-74. About the presenter: Daniel B. Kopans, MD, is the founder of the Breast Imaging Division of the Massachusetts General Hospital (MGH) and a Professor of Radiology at the Harvard Medical School. He is an internationally recognized expert in breast cancer detection and diagnosis. Basing his arguments on science and evidence, Dr. Kopans has been a champion of breast cancer screening and has been a major factor in preserving access for women ages 40-74 to early detection with lifesaving results. View the YouTube video: https://youtu.be/eiDwxuiqqvo To learn more about CCSN, visit us at survivornet.ca Follow CCSN on social media: Twitter - https://twitter.com/survivornetca Facebook - https://www.facebook.com/CanadianSurvivorNet Instagram: https://www.instagram.com/survivornet_ca/ Pinterest - https://www.pinterest.com/survivornetwork

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