Dr Dennis Slamon is a leading oncologist and researcher at the University of California, Los Angeles (UCLA). His groundbreaking research led to Herceptin, a targeted therapy to transform breast cancer treatment. Thousands of patients owe their lives to the efforts of Dr Dennis Slamon. In this interview he tells Professor John Crown about the family doctor that inspired his choice of career, he talks about his work in the lab and he shares his concerns for medical science because of the political climate in the USA in particular. Producer: Fergus Sweeney