Study shows "significant" rise of stage 4 breast cancer in women under 40

From 2000 to 2015, there was a more than 4% increase each year of stage 4 breast cancer cases in women under 40. That's according to a study published in the journal Radiology. Researchers who worked on the study say that's significant. Senior medical correspondent Dr. Tara Narula shares the story of a 30-year-old woman who has stage 4 breast cancer and looks at what may be behind this concerning trend.

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