Menu Close

Glossary

Showing 1001-1010 out of 1184 Terms

We're sorry, it looks like there has been an error. Please try again soon.

  • Retinoblastoma

    REH-tih-noh-blas-TOH-muh

    Cancer that forms in the tissues of the retina (the light-sensitive layers of nerve tissue at the back of the eye). Retinoblastoma usually occurs in children younger than 5 years. It may be hereditary or nonhereditary (sporadic).

  • Reye syndrome

    (ray SIN-drome)

    A rare disease that damages the brain and liver and causes death if not treated.

  • Rhabdomyosarcoma

    RAB-doh-MY-oh-sar-KOH-muh

    Cancer that forms in the soft tissues in a type of muscle called striated muscle. Rhabdomyosarcoma can occur anywhere in the body.

  • Risk group

    (risk groop)

    In medicine, risk groups are used to describe people who are alike in important ways. For example, patients with the same type of cancer may be divided into different risk groups that depend on certain aspects of their disease. These risk groups may be based on the patients’ chance of being cured (good versus poor) or the chance that their disease will come back (high versus low). Treatment may be based on which risk group a patient falls into. Risk groups can also be used to describe people who share traits and behaviors that affect their chance of developing a disease. For example, people who do not smoke are in a lower risk group for lung cancer than people who smoke.

  • Rituximab

    (rih-TUK-sih-mab)

    A drug used alone or with other drugs to treat certain types of B-cell non-Hodgkin lymphoma that are CD20 positive. It is used under the brand names Truxima and Rituxan to treat these cancers. Rituximab is also used under the brand name Rituxan to treat chronic lymphocytic leukemia that is CD20 positive. It is also being studied in the treatment of other conditions and types of cancer. Rituximab binds to a protein called CD20, which is found on B cells and some types of cancer cells. This may help the immune system kill cancer cells. Rituximab is a type of monoclonal antibody.

  • Rothmund-Thomson syndrome

    (ROT-moond-TOM-sun SIN-drome)

    A rare, inherited disorder that affects many parts of the body, especially the skin, eyes, bones, hair, and teeth. The main sign or symptom is a red blistering rash on the face that begins in early infancy. Over time, the rash can spread to the arms, legs, and buttocks and cause patchy skin coloring, areas of thin skin, and small clusters of blood vessels under the skin.

  • SEG

    A type of white blood cell essential to defend your body against infection.

  • SPF

    A scale for rating the level of sunburn protection in sunscreen products. The higher the SPF, the more sunburn protection it gives. Sunscreens with a value of 2 through 11 give minimal protection against sunburns. Sunscreens with a value of 12 through 29 give moderate protection. SPFs of 30 or higher give high protection against sunburn. Also called sun protection factor.

  • Saliva

    (suh-LY-vuh)

    The watery fluid in the mouth made by the salivary glands. Saliva moistens food to help digestion and it helps protect the mouth against infections.

  • Salivary gland

    (SA-lih-VAYR-ee gland)

    A gland in the mouth that produces saliva.