The modified liposomes were then added to the membranes of eye cancer cells - and sure enough the cells were found to respond to light.
It said that could "greatly increase the risk of cancer, skin and eye problems in later life".
The data will make it difficult, he says, for doctors to look pancreatic cancer patients in the eye and give them gemcitabine alone.
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In humans and other developed species it can cause eye cataracts and skin cancer.
Laser is the foundation of countless technologies we use each day: the Internet, digital media, computer hard drives, satellite broadcasting, laser eye surgery, and laser cancer treatment.
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Dendreon shares are up 4.9% today on news that the company plans to file with European regulators to sell its prostate cancer treatment Provenge there, with an eye toward a market launch in 2013.
Diagnosed with cancer in 2011, he spent several weeks out of the public eye both last year and at the beginning of 2012 for treatment.
As well as fighting off cancer and heart disease, vitamin A has also been linked to preventing macular degeneration, and eye condition that can lead to blindness.
Magnetic, nonradioactive nanoparticles (a tiny fraction of the thickness of a human hair and invisible to the human eye) are injected into the subject, where they bind only to known breast cancer cells within the body.
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More than a decade after the tumor was discovered, 5.8 percent of the men who received surgery had died from prostate cancer or its treatment, compared to 8.4 percent of patients where doctors just kept an eye on the tumor.
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