DCEG. . Outline 1. What is the point of epidemiology? 2. What causes cancer? 3. Why don\'t we know what causes cancer? 4. How have epidemiology investigations evolved? 5. Why lung cancer? 6. 7 questions about lung cancer I can\'t answer 7. Why bother studying genetics in a disease caused by smoking? 8. Where are the missing genes? 9. Tell me something I don\'t know 10. What next? .