NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 7,861 terms related to cancer and medicine.
Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.
- listen (… MEH-thul-seh-LEE-noh-L-SIS-teh-een)
- A substance that contains the element selenium (a nutrient that protects cells against damage) and is found in certain plants such as garlic and broccoli. Se-methyl-seleno-L-cysteine can act as an antioxidant and may help prevent or slow the growth of cancer cells. It is a type of amino acid.