A diagram illustrating the mechanism of action of Antibody-Drug Conjugate (ADC) in a cancer cell. (A): High-affinity Antibody binds to the drug, forming ADC, entering the double lipid-membrane layer of the cell to cause cell death. (B): ADC binds to the pro-survival receptor of cancer cells, inhibiting its function, commencing apoptosis. (C): ADC binds to both the membrane-surface antigen of the cancer cell and an effector cell in the immune system, inducing cellular cytotoxicity lysing the cancer cells. The figure was created with BioRender.com (Accessed on 1 February 2021) and was exported under a paid subscription.