NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,507 terms related to cancer and medicine.
We offer a widget that you can add to your website to let users look up cancer-related terms. Get NCI’s Dictionary of Cancer Terms Widget.
- topoisomerase inhibitor
- listen (TOH-poh-i-SAH-meh-rays in-HIH-bih-ter)
- A substance that blocks topoisomerases (enzymes that break and rejoin DNA strands and are needed for cells to divide and grow). Blocking these enzymes may kill cancer cells. Certain topoisomerase inhibitors are being studied in the treatment of cancer.