NCIt definition : An agonistic monoclonal antibody targeting the co-stimulatory receptor OX40 (CD134;
tumor necrosis factor receptor superfamily member 4; TNFRSF4), with potential immunostimulatory
and antineoplastic activities. Upon administration, anti-OX40 agonist monoclonal antibody
BGB-A445 selectively binds to OX40, thereby activating OX40. This induces the proliferation
of memory and effector T-lymphocytes and results in a T-cell-mediated immune response
against tumor cells, which leads to tumor cell lysis. OX40, a cell surface glycoprotein
and member of the tumor necrosis factor receptor superfamily (TNFRSF), is expressed
on T-lymphocytes and provides a co-stimulatory signal that promotes both the proliferation
and survival of activated T-cells.;