By Michael Erman The Merck logo is seen at a gate to the Merck & Co campus in Rahway, New Jersey, U.S., July 12, 2018. REUTERS/Brendan McDermid Dec 2 (Reuters) – U.S. drugmaker Merck & Co (MRK.N) hopes to patent a new formulation of its $20 billion cancer immunotherapy Keytruda that can be injected under the skin, allowing...
