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We think of the human immune system—for good reason—as our indispensable ally, our first line of defense against all kinds of invaders, including ones that can kill us if left unchecked. Yet in certain circumstances, cancer cells can turn the tables and make an enemy of our ally.NEXT ARTICLE
Cancer is not just one disease but many diseases. There are more than 100 different types of cancer. Most cancers are named for the organ or type of cell in which they start - for example, cancer that begins in the colon is called colon cancer; cancer th...