Cancer is one of the most feared words in medicine. But it’s not just one disease — it’s more than 100 different diseases, each driven by unique genetic changes. So why is cancer so difficult to cure? And are we closer than ever to changing that? On this episode of Health Matters, Mayo Clinic oncologist Dr. Tanios Bekaii-Saab joins host Kristen Meinzer to explain what cancer really is, how it develops and why it behaves differently from patient to patient — and even from cell to cell. They