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ACS & ASCO are Stronger Together: Cancer.Net content is?now available on cancer.org.

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Understanding Cancer

In the United States, 1 in 3 people will be diagnosed with cancer during their lifetime.?Here is some information to help you better understand what cancer is.

A histological slide of hairy cell leukemia

Learn About Cancer

Cancer is more than just one disease. There are many types of cancer, and it can develop anywhere in the body. Learn more about what cancer is, how it starts, and why it can be hard to cure.?

doctor goes over anatomy with patient in office

Resources to Learn More

Use these resources to learn more about terms related to cancer and parts of the body that might be affected by cancer. You can also learn about the history of cancer and how to find sources of information you can trust.