Rush Limbaugh and Shannen Doherty have advanced cancer. What does that mean? What is Stage IV?

Rush Limbaugh and Shannen Doherty have advanced cancer. What does that mean? What is Stage IV?

USATODAY.com

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Rush Limbaugh announced he had "advanced lung cancer" and Shannen Doherty said she was diagnosed with stage IV cancer. Here's what cancer stages mean.

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