Adjunct agent Meaning of adjunct agent: In cancer therapy, a drug or substance used in addition to the primary therapy. Also See: Aplidine Dietary Supplements Arrhenoblastoma ABVD regimen Anti-VEGFR-2 fully human monoclonal antibody IMC-1121B Amplimexon Art therapy Arteriogram Antimetabolite Antiretroviral therapy ALSO SEE: Vitamin E