UPDATE 2-OncoMed stock doubles after cancer drug deal with Celgene

* Celgene stock down 1.4 pct (Adds CEO, analyst comments, details on deal; updates share price)

from Reuters: Financial Services and Real Estate http://feeds.reuters.com/~r/reuters/financialServicesRealEstateNews/~3/BDoB8RaOEMc/story01.htm