The men and women who are trying to bring down cancer are starting to join forces rather than work alone. Together, they are winning a few of the battles against the world's fiercest disease. ... It's not like you don't have cancer and then one day you just do. Cancer—or, really, cancers, because cancer is not a single disease—happens when glitches in genes cause cells to grow out of control until they overtake the body, like a kudzu plant. Genes develop glitches all the time: There are roughly twenty thousand genes in the human body, any of which can get misspelled or chopped up. Bits can be inserted or deleted. Whole copies of genes can appear and disappear, or combine to form mutants. ... Cancer is not an ordinary disease. Cancer is the disease—a phenomenon that contains the whole of genetics and biology and human life in a single cell. It will take an army of researchers to defeat it.