Merck's Keytruda-LAG-3 combo fails to tame tough colorectal cancer in phase 3

An attempt by Merck & Co. to unlock the microsatellite stable (MSS) metastatic colorectal cancer market has ended in failure. The drugmaker found a fixed-dose combination of Keytruda and an anti-LAG-3 antibody failed to improve overall survival, extending the wait for a checkpoint inhibitor that moves the needle in the indication.