DOW JONES NEWSWIRES 
 

Biogen Idec Inc. (BIIB) offered to buy Facet Biotech Corp. (FACT) for about $356 million in a deal that would pay a 64% premium to bring its development partner under its umbrella.

The two companies have worked together since 2005 on treatments for multiple sclerosis and solid tumors. Under the proposal, Biogen would pay $14.50 a share for Facet, well above the $8.79 the company traded at Friday morning before being halted.

Biogen said it first showed interested in its development partner in mid-August, offering $15 a share. However, Facet's subsequent collaboration agreement with Trubion Pharmaceuticals - despite Biogen's request not to undertake any material transactions before completing its proposed transaction - led to the lower offer price. Biogen noted Facet's shares have fallen 22% since the announcement.

In a letter published Friday via press release, Biogen expressed disappointment over Facet's decision to enter the pact with Trubion, saying that move suggested Facet has "no interest in having a bona fide discussion about a combination."

A Facet representative wasn't immediately available for comment.

Biogen shares were recently up 47 cents at $50.38.

-By Jay Miller, Dow Jones Newswires; 212-416-2355; jay.miller@dowjones.com