NCIt definition : A humanized IgG4 monoclonal antibody against the semaphorin 4D (SEMA4D; CD100) with
potential immunomodulating and antineoplastic activities. Upon administration, pepinemab
binds to and neutralizes SEMA4D, thereby preventing binding of SEMA4D to its receptor
plexin-B1 (PLXNB1). By blocking the interaction of SEMA4D and PLXNB1, pepinemab may
cause an inhibition of endothelial cell activation and migration, eventually leading
to an inhibition of angiogenesis and tumor cell proliferation. Semaphorin 4D, a large
cell surface antigen found on the resting T-cell and overexpressed in a variety of
tumor cell types, plays an important role in vascular growth, tumor progression, invasion
and immune cell regulation.;