T cells work primarily by producing proteins called lymphokines. They attack without first having to recognize a specific antigen. Monocytes are white blood cells that can swallow and digest microscopic organisms and particles in a process known as phagocytosis. Antibodies respond to antigens by latching on to, or binding with, the antigens. Specific antibodies match specific antigens, fitting together much the way a key fits a lock.
Cytokines are substances produced by some immune system cells to communicate with other cells.
Types of cytokines include lymphokines, interferons, interleukins, and colony-stimulating factors. Some antibodies, cytokines, and other immune system substances can be produced in the laboratory for use in cancer treatment. They alter the interaction between the body's immune defenses and cancer cells to boost, direct, or restore the body's ability to fight the disease. BRMs include interferons, interleukins, colony-stimulating factors, monoclonal antibodies, and vaccines. Researchers continue to discover new BRMs, learn more about how they function, and develop ways to use them in cancer therapy.