Merck’s Davis Looking to Diversify in Preparation for Keytruda Patent Cliff

Merck’s blockbuster cancer drug Keytruda has been called a “franchise in a drug.” Patients rely on it, and Merck depends on it for a substantial amount of its overall revenue. But, as with all good things, the run must come to an end, and Merck’s patent exclusivity on Keytruda expires in 2028.