Among the stock activity stories for Monday, Sept. 10, from AP Business News:
— Shares of Geron Corp. plunged after the company announced two setbacks for its experimental cancer drug imetelstat, saying it has ended one study of the treatment and does not expect the drug to succeed in a second.
— Shares of Plains Exploration & Production Co. fell after the oil and gas company said it will buy some deepwater Gulf of Mexico assets from BP PLC and at least one analyst said it's paying too much.
— Shares of Peregrine Pharmaceuticals Inc. continued to rise following successful clinical trial results for the company's cancer drug bavituximab.
