Have you ever wondered why cancer remains such a dreadful illness? Why is it so common? How can you reduce your cancer risk? Why is screening not better at finding cancers early? How does cancer make people feel so sick? How do different types of treatment work, why might they fail, and how do they cause side effects? What role does our immune system play? Do alternative and complementary therapies work? Why has progress been so painfully slow? What can we do to speed progress? How can we reduce the very high cost of effective new therapies?