On Thursday, Merck & Co Inc (NYSE: MRK) topped estimates with its fourth quarter revenue and adjusted earnings fueled by its blockbuster cancer drug Keytruda, along with HPV prevention vaccine Gardasil. However, Merck still recorded a net quarterly loss due to charges that resulted from a deal to co-develop three after-cancer treatments with a Japanese drugmaker Daiichi Sankyo. But, Merck’s patent for Keytruda is expiring in 2028 so it needs more products under its belt. Like its peers, Moderna