Given all the understandable pessimism there is about the world, you might not realize that we’re living in a golden era of cancer treatment.

In January, the American Cancer Society reported that the five-year survival rate of cancer in the U.S. is now 70%—the highest mark reached to date. Preventive screening programs and the decline in major risk factors like smoking have played a big role in that success, to be sure, but doctors today are also able to treat and manage cancers that were once considered a death sentence.

One of the more groundbreaking advances in cancer treatment has been chimeric antigen receptor T cell therapy, simply known…

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