Her mother had breast cancer at forty-eight. Her aunt had ovarian cancer. She's been told to keep an eye on it — but no one has ever walked her through what her own risk actually is. Dr. Kelli Peiffer explains what precision medicine means for women, and how genetic testing turns vague risk into an actual plan.

Up to 1 in 3 people in the United States will develop cancer in their lifetime. But not all cancers work the same way — and understanding whether your family history points to a hereditary pattern could be one of the most useful things you do for your long-term health.