Swiss pharmaceutical group Novartis AG is thought to be considering selling its minority 20% stake in sector rival Roche Holding AG , according to a report published today by German daily Handelsblatt . Company CEO Daniel Vasella told the paper that Novartis is no longer talking to Roche about a cooperation. He explained: "It wouldn't be right for Novartis to let so much money be blocked long-term if there shouldn't be any cooperation and no common interests with Roche.