Bristol-Myers Squibb Co. has agreed to buy Celgene Corp. in a cash and stock deal valued at $74bn that will diversify the big pharma beyond its top product Opdivo (nivolumab), but the deal comes with risks that will be shifted from Celgene's investors to Bristol's.
The transaction announced Jan. 3 will expand Bristol's presence in oncology and immunology, where it already has a strong presence,...








