Tesaro doubles after niraparib shows survival benefit

Tesaro Inc. (NASDAQ:TSRO) soared $40.19 (108%) to $77.40 on Wednesday, adding $1.8 billion in market cap, after it said niraparib ( MK-4827) met the primary endpoint of improving progression-free survival (PFS) in the Phase III NOVA trial. The study evaluated niraparib

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