Pembrolizumab is an immunoglobulin G4, with a variable region against the human programmed cell death 1 receptor, a humanized mouse monoclonal [228-L-proline(H10-S>P)]γ4 heavy chain (134-218') disulfide and a humanized mouse monoclonal κ light chain dimer (226-226:229-229)-bisdisulfide [REF].
It is recombinantly manufactured in Chinese hamster ovary (CHO) cells [REF].