Also

* Geron Corp., which is developing a cancer vaccine, said it would raise as much as $24 million through a stock sale. Investors Mainfield Enterprises Inc. and Riverview Group have agreed to buy $18.4 million of Menlo Park, Calif.-based Geron’s stock, according to a regulatory filing.

* Business supplies chain Office Depot Inc. offered to buy a major French office supplies retailer for about $870 million, a move to double its European business and vault past archrival Staples Inc. to the top spot globally. France’s Pinault Printemps Redoute responded by agreeing to exclusive negotiations.