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Pembrolizumab is a humanized monoclonal antibody that binds to programmed cell death-1 (PD-1) receptor and blocks interaction with its ligands PD-L1 and PD-L2, resulting in the activation of T lymphocytes. The new dosage approval was granted based on pharmacokinetic modeling, exposure-response, and exposure-safety data from a trial that aimed to determine whether a longer dosing interval would provide greater flexibility and convenience to patients and their healthcare providers. Overall, 400 mg pembrolizumab administered every 6 weeks demonstrated similar pharmacokinetics and safety to the dose already approved by the FDA.2
The continued approval of the 400 mg dosage may be contingent upon verification of patient benefit in future confirmatory trials.1
Read our previous coverage of pembrolizumab’s FDA approval here and EMA approval here.
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