U.S. drugmaker Merck & Co Inc on Friday reported quarterly profit that edged past estimates, helped by strong demand for its blockbuster cancer treatment Keytruda.

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Sales of Keytruda, the most important drug in Merck’s portfolio, rose 66 percent to $2.15 billion in fourth quarter, compared with analysts’ average estimate of $2.12 billion, according to IBES estimates from Refinitiv.

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