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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2013-12-09T00:00:00-05:00" class="date-display-single">December 9, 2013</span></p><div class='syndicate'><h1>Gut Microbes May Affect Cancer Treatment</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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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2013/20131209-cancer.jpg?itok=DTF-UDnz&timestamp=1431709923 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2013/20131209-cancer.jpg?itok=kSIgOTKZ&timestamp=1431709923 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/2013/20131209-cancer.jpg?itok=YiR9BQ4V&timestamp=1431709923 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/2013/20131209-cancer.jpg?itok=_KS3KTFt&timestamp=1431709923" alt="A group of bacteria" title="A group of bacteria" />
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</picture><span class="caption">The bacterium Enterococcus faecalis, which lives in the human gut.</span><span class="credit">Centers for Disease Control and Prevention (CDC)</span></div>
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</div><p>The effectiveness of certain cancer therapies may depend on microbes that live in the intestine, according to a study in mice. The findings suggest that antibiotics used to treat infections might hinder the effects of anti-cancer therapies.</p>
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<p>The human gut harbors a complex community of microbes, collectively called microbiota. Recent research has revealed many aspects of our health that are affected by intestinal microbiota. For instance, gut microbes can influence both local and body-wide immune system activity and inflammation.</p>
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<p>Some cancer therapies work by stimulating anti-cancer immune responses. To investigate whether gut microbes can affect cancer treatments, scientists at NIH’s National Cancer Institute (NCI) studied germ-free mice, raised in sterile conditions from birth. These mice harbor no bacteria. The team also studied conventionally raised mice given a potent antibiotic cocktail in their drinking water beginning 3 weeks prior to the experiments.</p>
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<p>Lymphoma, colon, and melanoma cancer cells were injected under the skin of the mice. The cells formed tumors that grew to a diameter of one-fifth of an inch or more. The tumors were then treated with either an immunotherapy that included CpG-oligonucleotides or with the mainstay chemotherapy drugs oxaliplatin and cisplatin. The immunotherapy stimulates an immune attack on cancer cells, whereas the chemotherapy drugs directly damage tumors. The study, led by Drs. Romina Goldszmid and Giorgio Trinchieri of NCI, appeared on November 22, 2013, in <em>Science</em>.</p>
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<p>The researchers found that tumors responded poorly to the immunotherapy in both germ-free mice and mice that received the antibiotic cocktail. The tumors in these mice also responded poorly to oxaliplatin and cisplatin. Further research showed that the mice produced lower levels of immune signaling molecules called cytokines after treatment than control mice. The germ-free and antibiotic-treated mice also had reduced expression of genes involved in inflammation.</p>
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<p>In a related study that appeared in the same issue of <em>Science</em>, a team led by Dr. Laurence Zitvogel of the Gustave Roussy Institute in Paris showed that the gut microbiota helps to shape the immune response to a different type of chemotherapy drug, cyclophosphamide.</p>
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<p>“The use of antibiotics should be considered as an important element affecting microbiota composition. It has been demonstrated, and our present study has confirmed, that after antibiotic treatment the bacterial composition in the gut never returns to its initial composition,” Trinchieri says. “Thus, our findings raise the possibility that the frequent use of antibiotics during a patient’s lifetime or to treat infections related to cancer and its side effects may affect the success of anti-cancer therapy.”</p>
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<p>The researchers now plan to study how antibiotics and gut bacteria might affect tumor therapy in people. They will also continue studying mice to characterize the molecular signaling between gut microbes and the immune system.</p>
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</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/gut-microbes-diet-interact-affect-obesity" target="_top">Gut Microbes and Diet Interact to Affect Obesity</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/neighbors-help-cancer-cells-resist-treatment" target="_top">Neighbors Help Cancer Cells Resist Treatment</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/tumor-imaging-technique-tracks-responses-cancer-therapies" target="_top">Tumor Imaging Technique Tracks Responses to Cancer Therapies</a></li><li><a href="https://newsinhealth.nih.gov/issue/nov2012/feature1" target="_top">Your Microbes and You: The Good, Bad and Ugly</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/healthy-human-microbiome" target="_top">The Healthy Human Microbiome</a></li><li><a href="http://www.cancer.gov/cancertopics" target="_top">Cancer Topics</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="http://www.ncbi.nlm.nih.gov/pubmed/24264989">Commensal bacteria control cancer response to therapy by modulating the tumor microenvironment.</a> <em>Science</em>. 2013 Nov 22;342(6161):967-70. doi: 10.1126/science.1240527. PMID: 24264989. <a href="http://www.ncbi.nlm.nih.gov/pubmed/24264990">The intestinal microbiota modulates the anticancer immune effects of cyclophosphamide.</a> <em>Science</em>. 2013 Nov 22;342(6161):971-6. doi: 10.1126/science.1240537. PMID: 24264990.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH's National Cancer Institute (NCI) and National Institute of Allergy and Infectious Diseases (NIAID); and the Japanese Society for Promotion of Science Research Fellowship for Japanese Biomedical and Behavioral Researchers at NIH.</p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/brain-changes-observed-during-pregnancy">Brain changes observed during pregnancy</a></p>
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||
<p><a href="https://www.nih.gov/news-events/nih-research-matters/research-context-detecting-cancer">Research in Context: Detecting cancer</a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/risk-future-burden-dementia-united-states">Risk and future burden of dementia in the United States </a></p>
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||
|
||
<p><a href="https://www.nih.gov/news-events/nih-research-matters/complete-wiring-map-adult-fruit-fly-brain">Complete wiring map of an adult fruit fly brain</a></p>
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<p><strong>Editor:</strong> Harrison Wein, 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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