The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.

Editorial changes were made to this summary.

Several enhancements have been made to this summary to better explain certain medical concepts and to help readers find information about clinical trials. The following changes were made:

• Text describing the way cancer spreads in the body was added to the Stages ¹ section.
• Information about patients taking part in clinical trials and about follow-up tests was added to the Treatment Option Overview ² section.
• Links to ongoing clinical trials listed in NCI's PDQ Cancer Clinical Trials Registry were added to the Treatment Options ³ section.
• A new section called "To Learn More ⁴" was added. It includes links to more information about this type of cancer and about cancer in general.
• The "Get More Information from NCI" section (originally called "To Learn More") was revised.

Glossary Terms

A type of research study that tests how well new medical approaches work in people. These studies test new methods of screening, prevention, diagnosis, or treatment of a disease. Also called a clinical study.