NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,020 terms related to cancer and medicine.
- variable expression
- listen (VAYR-ee-uh-bul ek-SPREH-shun)
- Refers to the difference in the way that signs and symptoms of a genetic condition can show up in individual patients who have that condition. For example, some patients with neurofibromatosis type 1 may have only mild symptoms, such as brown spots and freckling on the skin, and others may have more severe symptoms, such as brain tumors and tumors on the nerves.