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US Regulators Approve New Cancer Drug with Novel Action

The U.S. Food and Drug Administration this week gave the green light to the pharmaceutical company Merck’s anti-cancer compound Keytruda, a novel drug designed to fight advanced melanoma. Keytruda has a unique action, enlisting the body’s immune response against the lethal cancer. Normally, cancerous tumors disarm the immune system. But Keytruda inhibits the action of one of the proteins tumors use to block immune response. Known generically as pembrolizumab, the drug...

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