Teniposide is a cancer (antineoplastic) medication. Teniposide interferes with the growth of cancer cells and slows their growth and spread in the body. Teniposide produces its anti-cancer effects by inhibiting an enzyme, topoisomerase, which is responsible for maintaining structural function and integrity of DNA. By inhibiting the normal activity of topoisomerase, teniposide inhibits proper DNA synthesis, ultimately causing cellular death.
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