Definition

An allogeneic irradiated human lung cancer cell vaccine expressing a fusion protein composed of the OX40 ligand (OX40L) linked to an immunoglobulin (Ig) (OX40L-Ig), with potential immunomodulating and antineoplastic activities. Upon intradermal administration of irradiated allogeneic human lung cancer cells expressing OX40L-Ig vaccine HS-130, the irradiated lung cancer cells continuously express OX40L-Ig. OX40L may then target, bind to and activate its cognate receptor, tumor necrosis factor receptor superfamily member 4 (TNFRSF4; OX40; CD134), which is expressed on activated T cells. OX40L/OX40 binding promotes increased cytokine production, and induces the proliferation and activation of memory and effector T lymphocytes against the human lung cancer cells. In turn, this promotes a CTL-mediated immune response against the endogenous lung cancer cells. OX40L, a cell surface glycoprotein and member of the tumor necrosis factor (TNF) ligand family, provides a co-stimulatory signal for the proliferation and survival of activated T cells.