Cancer Basics

This section provides information on the following topics:

What is Cancer?

Cancer is a group of more than 100 different diseases characterized by the uncontrolled, abnormal growth of cells. These cells form a lump or mass called a tumor. This section contains information about cancer.

The Cancer Care Team

Learn how multiple professionals work as part of a health care team, which often includes oncologists, oncology nurses, and additional health care professionals.


Genetics is the study of how traits and diseases are inherited from one generation to the next. This section provides information on genetics and cancer, genetic testing, and genetic information for individual cancer types.

Medical Illustrations Gallery

Full-color illustrations of common sites where cancer occurs, organized by cancer type, including a version that can be downloaded and printed on an 8.5" x 11" page. The gallery includes both anatomical illustrations and illustrations of the cancers by stage.

Treatment Terms

This article defines cancer terms that you may hear your doctor use when you are being treated for cancer.