A recombinant chimeric, mouse-human monoclonal antibody directed against tumor necrosis factor alpha (TNF-alpha), a protein involved in inflammation, cell survival, and apoptosis. Infliximab may be pro- apoptotic or anti-apoptotic, depending on cell type. or A monoclonal antibody that blocks the action of a cytokine called tumor necrosis factor alfa. It is being studied in the treatment and prevention of weight loss and loss of appetite in patients with advanced cancer. It belongs to the family of drugs called monoclonal antibodies.