(Reuters) - Swiss drugmaker Novartis will buy U.S. gene therapy company AveXis Inc for $8.7 billion in cash, the companies said on Monday.

The $218-per-share offer represents a premium of 88 percent to AveXis' Friday close.

(Reporting by Kanishka Singh in Bengaluru; Editing by Gopakumar Warrier)

Stocks treated in this article : Novartis, AveXis Inc