You tell me. I’m not a Merck expert, but to my knowledge Merck does not commercially market any (anti-cancer) cellular therapies.
They have said this in 2022 about clinical efforts.
Cell-Based Therapies & T/NK Cell Engagers: Through our collaborations with Dragonfly and Janux Therapeutics, we are exploring bi- and tri-specific Natural Killer and T-cell engagers. We are also evaluating allogeneic cell therapies through our collaborations with Artiva and A2 Biotherapeutics.
However, I do know they are sponsoring dendritic cell vaccine trials.