NEW YORK (Reuters) - Modern cancer drugs supercharge immune systems, target specific gene mutations and pack modified viruses into vaccines. Amid the increasing sophistication, one investigational treatment stands out for its simplicity.br clear='all'/img width='1' height='1' src='http://reuters.us.feedsportal.com/c/35217/f/654220/s/4ddd250f/sc/14/mf.gif' border='0'/div class="feedflare"
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