In two phase III studies, Merck & Co. Inc.’s oral, once monthly proprotein convertase subtilisin/kexin type 9 (PCSK9) inhibitor produced statistically significant and clinically meaningful cuts in low-density lipoprotein cholesterol levels. The PCSK9 inhibitor is looking to fit into a crowded market that already has well-established therapies from other big pharmas and a potential competitor in development to treat another indication.