An estimated 30 million Americans are diagnosed with a rare disease. Before whole genome sequencing, it sometimes took more than a decade to find the specific genetic mutation.

Millions of people in the U.S. have a genetic variant that raises their risk of cancer. Genetic testing can help people find cancer earlier and seek treatment. But many patients aren't offered it.

For some people, a rare genetic mutation makes dementia inescapable. Three sisters have decided to confront fate with a genetic test and have joined a research project on possible treatments.

Cooking and sharing elaborate meals was her joy. Then she learned a mutation in her genes puts her at extremely high risk of gastric cancer. Could she lose her stomach to save her life?