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Even low levels of light in bedrooms may stop breast cancer drugs from working, US researchers have warned.
Animal tests showed light, equivalent to that from street lamps, could lead to tumours becoming resistant to the widely used drug Tamoxifen.
The study, published in the journal Cancer Research, showed the light affected sleep hormones, which in turn altered cancer cell function.
UK experts said it was an intriguing finding, but not proven in people.
Tamoxifen has transformed the treatment of breast cancer by extending lives and increasing survival times.
It stops the female hormone oestrogen fuelling the growth of tumours although the cancerous cells may eventually become resistant to the drug.
http://www.bbc.co.uk/news/health-28442551
Animal tests showed light, equivalent to that from street lamps, could lead to tumours becoming resistant to the widely used drug Tamoxifen.
The study, published in the journal Cancer Research, showed the light affected sleep hormones, which in turn altered cancer cell function.
UK experts said it was an intriguing finding, but not proven in people.
Tamoxifen has transformed the treatment of breast cancer by extending lives and increasing survival times.
It stops the female hormone oestrogen fuelling the growth of tumours although the cancerous cells may eventually become resistant to the drug.
http://www.bbc.co.uk/news/health-28442551