In 2009, Anya Plutynski - a historian and philosopher of biology - was diagnosed with breast cancer. Despite all of her experience with scientific research, Plutynski struggled to fully understand her disease. How do scientists and doctors define cancer? Why are some screening and treatment options recommended over others? When and how do values enter the picture? In this episode, Plutynski shares her story, her opinions on ongoing debates over breast cancer screening, and ideas from her forthcoming book Explaining Cancer: Philosophical Issues in Cancer Causation, Evidence & Explanation.