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immunotoxin

(IH-myoo-noh-TOK-sin)
An immune substance, such as a monoclonal antibody, cytokine, or immunoglobulin, chemically linked to a toxic substance. The immune substance binds to specific proteins or receptors found on some cancer cells. This allows the linked toxic substance to enter the cancer cells and kill them without harming nearby healthy cells.
Search NCI's Dictionary of Cancer Terms