Celgene Corp said on Monday it would pay about $9 billion in cash to acquire the rest of Juno Therapeutics Inc and gain access to Juno's experimental gene therapy to treat cancer.

The $9 billion represents an offer $87 per share to Juno's shareholders and the deal, agreed by both boards, is expected to close in the first quarter of 2018.The acquisition will add JCAR017, Juno's experimental treatment for a type of blood cancer, to Celgene's lymphoma program.

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