Merck Sharp & Dohme Corp. (MSD), known as Merck & Co. Inc. in the U.S. and Canada, terminated its potential $1.86 billion deal with San Diego-based Artiva Biotherapeutics Inc. for novel chimeric antigen receptor-natural killer cell therapies. GC Cell disclosed news of the terminated deal on the Korea Exchange near market close of June 25, saying it was notified by Artiva after the decision was reached by MSD’s internal decision makers.