There's a phrase in Shakespeare: he refers to it as the 'hidden imposthume', and this idea of a hidden swelling is seminal to cancer. But even in more contemporary writing it's called 'the big C'.
Writing anything as an expert is really poisonous to the writing process, because you lose the quality of discovery.
Most discoveries even today are a combination of serendipity and of searching.
Robert Sandler is a child who died when he was three years old, and he is a child who was the first child that we know of to be treated with chemotherapy.
I had seen cancer at a more cellular level as a researcher. The first time I entered the cancer ward, my first instinct was to withdraw from what was going on - the complexity, the death. It was a very bleak time.
Why did I write 'The Emperor of All Maladies?' A 56-year-old woman with an abdominal sarcoma, having undergone two remissions and a relapse, asked me to describe what she was battling. By the time I had finished answering her, I realised that I had written 600 pages.