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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/nih-research-matters">NIH Research Matters</a></div> <div class="l-region l-region--section-header">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2011-12-05T00:00:00-05:00" class="date-display-single">December 5, 2011</span></p><div class='syndicate'><h1>Targeted Light Therapy Destroys Cancer Cells</h1><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<picture title="Electron microscope image showing a cluster of misshapen cells">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2011/20111205-light.jpg?itok=J6gpwTyG&timestamp=1433360884 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2011/20111205-light.jpg?itok=VAWWp5hR&timestamp=1433360884 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2011/20111205-light.jpg?itok=oJRReOn7&timestamp=1433360884 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2011/20111205-light.jpg?itok=ABvRqRyl&timestamp=1433360884 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2011/20111205-light.jpg?itok=zVqACWfw&timestamp=1433360884 1x" media="screen and (min-width: 0)" />
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2011/20111205-light.jpg?itok=VAWWp5hR&timestamp=1433360884" alt="Electron microscope image showing a cluster of misshapen cells" title="Electron microscope image showing a cluster of misshapen cells" />
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</picture><span class="caption">A cluster of breast cancer cells. </span><span class="credit">Annie Cavanagh. All rights reserved by Wellcome Images. </span></div>
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</div><p>Scientists have developed a noninvasive technique that uses light to selectively wipe out cancerous cells in mice without harming surrounding tissue. With further research, this novel method might eventually be used to treat tumors in humans.</p>
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<p>The 3 major types of cancer therapy — surgery, radiation and chemotherapy — effectively destroy cancerous tissues, but tend to damage normal tissue as well. Researchers have long sought therapies that can zero in on tumor cells and leave neighboring healthy cells intact. One targeted technique, available for over a decade, is called monoclonal antibody (mAb) therapy. These antibodies destroy cancer cells by latching onto specific proteins on the cell surface. Researchers can also attach a deadly payload for mAbs to carry to target cells. Over 25 therapeutic mAbs have been approved by the US Food and Drug Administration to date. But current mAb therapies often require repeated doses at levels that can cause serious side effects.</p>
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<p>To try a new approach, Dr. Hisataka Kobayashi and his colleagues at NIH's National Cancer Institute (NCI) decided to couple mAbs with photosensitive dye molecules that respond to specific, harmless wavelengths of light. The unique method, called photoimmunotherapy, was described in the November 6, 2011, online edition of <em>Nature Medicine. </em></p>
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<p>After evaluating several light-sensitive molecules, the researchers settled on a fluorescent dye called IR700, which is activated by near infrared light. They chemically linked IR700 to 3 different mAbs. One antibody targets HER2, a cell-surface molecule that's expressed at high levels by some breast cancer cells. Another binds to EGFR, a receptor molecule prevalent on some lung, pancreatic and colon cancer cells. The third mAb homes in on PSMA, a molecule overexpressed by prostate cancer cells.</p>
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<p>The researchers found that the mAb-IR700 complexes effectively attached to cultured cancer cells. When exposed to near-infrared light, the targeted cells rapidly died. In contrast, cells that weren't bound by the complexes were unharmed.</p>
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<p>Mice with cancer were injected with the mAb-IR700 that targets EGFR. The animals showed dramatic tumor shrinkage after even a single dose of near-infrared light. The treatment appeared to be safe, with no signs of toxicity.</p>
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<p>Other photosensitizing molecules have been used to treat cancer in the past. But these conventional, untargeted photosensitizers can damage both healthy and cancerous tissue. In addition, the type of light needed to activate these molecules can penetrate through less than 1 cm of tissue (about a third of an inch). The near-infrared light used to activate IR700 can penetrate tissue to a depth of several centimeters, more than an inch.</p>
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<p>Low doses of mAb-IR700 can also help identify cancerous cells in tissues, because the complex emits a small amount of light. As treated tumors shrank, their fluorescence dimmed and eventually disappeared.</p>
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<p>“The ability to join different mAbs to IR700 means that this technique might be used as a non-invasive guide to monitor the results of treatments,” says Kobayashi. “Although more testing will be needed, we believe this method has the potential to replace some surgical, radiation and chemotherapy treatments.”</p>
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</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="http://www.cancer.gov/cancertopics/factsheet/Therapy/photodynamic" target="_top">Photodynamic Therapy for Cancer</a></li><li><a href="http://www.cancer.gov/cancertopics/factsheet/Therapy/targeted" target="_top">Targeted Cancer Therapies</a></li></ul>
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<h3 class="block__title">About NIH Research Matters</h3>
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<p><strong>Editor:</strong> Harrison Wein, Ph.D.</p>
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<p><strong>Assistant Editors:</strong> Vicki Contie and Brian Doctrow, Ph.D.</p>
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<p><strong><em>NIH Research Matters </em></strong>is a weekly update of NIH research highlights reviewed by NIH’s experts. It's published by the <a href="/institutes-nih/nih-office-director/office-communications-public-liaison">Office of Communications and Public Liaison</a> in the <a href="/institutes-nih/nih-office-director">NIH Office of the Director</a>.</p>
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<p>ISSN 2375-9593</p>
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