These Questions originally appeared on Quora - the knowledge sharing network where compelling questions are answered by people with unique insights. Answers by William G. Nelson, M.D., Ph.D., Director of the Johns Hopkins Kimmel Cancer Center, on Quora. Q: What makes cancer so hard to solve? A: Cancer is a collection of many diseases characterized by the uncontrolled growth of cells that usually arises from changes in DNA (mutations). Because of mutations, the processes that normally tell our cells when to start and stop multiplication and growth go awry. The biology of cancer, from the number and type of mutations that flip the switch to uncontrolled growth to the influence of non-cancerous...
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