RAHWAY, N.J.--(BUSINESS WIRE)-- Merck (NYSE: MRK ), known as MSD outside of the United States and Canada, today announced the discontinuation of the clinical development programs for vibostolimab, an anti-TIGIT antibody, and favezelimab, an anti-LAG-3 antibody. Vibostolimab is being evaluated as an investigational fixed-dose combination with pembrolizumab (KEYTRUDA ® ) in the KeyVibe program. Favezelimab is being evaluated as an investigational fixed-dose combination with pembrolizumab in the KEYFORM program.