T-regulatory Cell Depletion with E7777 Combined with Pembrolizumab in Recurrent or Metastatic Solid Tumors

Pembrolizumab is a humanized monoclonal immunoglobulin (Ig) G4 antibody that inhibits lymphocytes PD-1 receptors, blocking the ligands that would deactivate it and prevent an immune response, allowing the immune system to target and destroy cancer cells.

E7777 or denileukin diftitox is a recombinant cytotoxic fusion protein composed of the amino acid sequences for diphtheria toxin fragments A and B (Met1-Thr387)-His and for human interleukin-2 (Ala1-Thr133), indicated for the treatment of patients with persistent or recurrent cutaneous T-cell lymphoma (CTCL) whose malignant cells express the CD25 component of the IL-2 receptor.