NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,812 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.

vitamin H
(VY-tuh-min …)
A nutrient in the vitamin B complex that the body needs in small amounts to function and stay healthy. Vitamin H helps some enzymes break down substances in the body for energy and helps tissues develop. It is found in yeast, whole milk, egg yolks, and organ meats. Vitamin H is water-soluble (can dissolve in water) and must be taken in every day. Not enough vitamin H can cause skin, nerve, and eye disorders. Vitamin H is present in larger amounts in some cancer tissue than in normal tissue. Attaching vitamin H to substances used to treat some types of cancer helps them find cancer cells. Also called biotin.