A Phase I/II Study of Nivolumab, Ipilimumab and Plinabulin in Patients With Recurrent Small Cell Lung Cancer

A fully human immunoglobulin (Ig) G4 monoclonal antibody directed against the negative immunoregulatory human cell surface receptor programmed death-1 (PD-1,PCD-1,) with immune checkpoint inhibitory and antineoplastic activities.

Plinabulin (BPI-2358) is a synthetic, low molecular weight, new chemical entity originally developed by Nereus Pharmaceuticals, Inc., and now by BeyondSpring Pharmaceuticals, Inc. It belongs to the diketopiperazine class of compounds with a chemical name 2, 5-piperazinedione, 3-\[\[5-(1,1-dimethylethyl)-1H-imidazol-4-yl\[methylene\]-6-(phenylmethylene)-, (3Z,6Z) (trivial name t-butyl-dehydrophenylahistin).

Ipilimumab is a monoclonal antibody that works to activate the immune system by targeting CTLA-4, a protein receptor that downregulates the immune system.