Originally, therapeutic administration of serum or immune globulin containing preformed antibodies produced by another individual. Currently, immunotherapy includes nonspecific systemic stimulation, adjuvant, active specific immunotherapy, and adoptive immunotherapy. New forms of immunotherapy include the use of monoclonal antibodies. Syn: biologic immunotherapy.
This method has been widely adopted in oncology, particularly in cases that fail to respond to other treatment. Immunotherapy seeks to boost immune system function, as with the administration of interferons and interleukin-2, or to attack cancerous cells directly, as with the injection of monoclonal antibodies. Several alternative medical practices are claimed to enhance immune function, and various over-the-counter substances (e.g., goldenseal, L-lysine) have gained popularity for this supposed property.
Reference: Stedman's Medical Dictionary