When I was a child, I asked my father what causes cancer and he paused for a long moment before saying, “Life. Life causes cancer.” I took this as an artful dodge until I read Siddhartha Mukherjee’s history of cancer, in which he argues not only that life causes cancer but that cancer is us. “Down to their innate molecular core,” Mukherjee writes, “cancer cells are hyperactive, survival-endowed, scrappy, fecund, inventive copies of ourselves.” And this, he notes, “is not a metaphor.”
