Thu Aug 15, 2013 11:11am EDT
(Reuters) - Shares of Onyx Pharmaceuticals Inc (ONXX.O) fell as much as 10 percent on Thursday after a Bloomberg report that a widely expected takeover of the company by Amgen Inc (AMGN.O) had been held up by a dispute over access to Onyx's cancer drug data.
The two companies agreed to the deal price but were in dispute over whether Onyx would provide Amgen with data from a study of Onyx's blood-cancer drug Kyprolis, Bloomberg reported, citing three sources. (r.reuters.com/bep42v)
Onyx does not want to access the data before the study â" designed for European approval of the drug â" is over, as it may slow the approval process, Bloomberg said.
Reuters reported last week that Onyx was close to selling itself to Amgen for about $9.5 billion and that a deal announcement could come very soon.
Cancer treatments that can bring in healthy profits represent a huge opportunity for bigger drugmakers looking for ways to shore up their product pipelines.
Onyx sells Nexavar â" a treatment for liver and kidney cancer â" and colon cancer drug Stivarga, both in partnership with Germany's Bayer AG (BAYGn.DE).
Onyx began selling Kyprolis in the United States last year, as a treatment for multiple myeloma, and some analysts expect the drug to hit peak annual sales of $3 billion.
The company's shares were down 5 percent to $118 on Thursday morning on the Nasdaq, after touching a low of $112.
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