Pfizer to buy Medivation in $14 bln deal By: Reuters: Company News August 22, 2016 at 06:54 AM EDT Aug 22 (Reuters) - Pfizer Inc said it would buy U.S. cancer drug company Medivation Inc in a deal valued at about $14 billion to boost its oncology portfolio. Read More >> Related Stocks: Celgene Corp Gilead Sciences Merck & Co Pfizer