Promising Method to Reduce Risk of Breast Cancer Ignored by Government Study

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While warning of the danger of using light at night, this report, funded by the National Institutes of Health, failed to include reference to the possible benefit of using light bulls that filter out the blue rays known to suppress melatonin, that are available from Photonic Developments LLC at

The 260 page report, out this month, from the Interagency Breast Cancer and Environmental Research Coordinating Committee (IBCERCC) is the result of more than two years study by a distinguished group of scientists from many government agencies and others. They detail the evidence that many environmental factors increase the risk of breast cancer. The list includes many that are well known such as family history, genetic variants, breast density, alcohol, tobacco smoke, obesity, early menarche, and lesser known ones like exposure to light at night.

The report mentions both studies in humans and animals. For example they mention the increased risk of breast cancer in women who work night shift for a long time. They mention studies in rats that have been given a carcinogen and then treated with melatonin. The time to develop tumors is increased and the number of tumor decreased.

An important shortcoming of the report is not mentioning the definitive studies that relate the suppression of melatonin to the exposure to ordinary levels of light as is found in homes. Another omission is the lack of discussion of the importance of the color of the light, with blue light being most effective in suppressing melatonin.

It is the last fact that makes it possible to reduce the damaging effect of light at night by using light bulbs that don’t produce blue light or by wearing glasses that eliminate the blue rays. The products were developed in 2005 by a team of physicists at John Carroll University led by Richard Hansler PhD. He has written two books “Great Sleep! Reduced Cancer!” and “Heroes of Cancer Prevention Research” available from Amazon as paperback or Kindle books. The special light bulbs and glasses are available at along with filters for TV and computer screens including iPad and iPhone filters. For information contact Dr. Hansler at 216 397 1657 or at rhansler(at)jcu(dot)edu.

It will be many years (if ever) before studies are completed to show that avoiding blue light in the hours before bedtime in order to maximize the time when melatonin is present in the blood stream, will reduce the risk of cancer. In the meantime, wise women can obtain the benefits of using these products to help their sleep, while enjoying the other possible benefits.

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Richard Hansler
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