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The Bristol-Myers Squibb-vs.-Merck match in melanoma is on. Bristol-Myers ($BMY) scored FDA approval for its cancer immunotherapy Opdivo (nivolumab) three months ahead of schedule, setting it up for a head-to-head contest against Merck's ($MRK) recent debut in the same class,Keytruda.
Both Keytruda and Opdivo block PD-1, a mechanism cancer cells use to escape detection by the body's immune system, and as cancer immunotherapies, they're among the hottest tickets in oncology these days. Keytruda ...
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