Pharmaceutical US pharma giant Merck & Co, known as MSD outside of the USA and Canada, announced that calderasib (MK-1084), an investigational oral specific KRAS G12C inhibitor, in combination with Keytruda (pembrolizumab), Merck’s anti-PD-1 therapy, has been granted Breakthrough Therapy designation by the US Food and Drug Administration (FDA). 29 May 2026