Cancer is the taboo topic in health food stores. Sure, we’re always eager to talk about prevention, but when it comes to treatment, we shy away from concrete statements. We do this because, while many of us have considerable knowledge about the herbs and vitamins in question, we rarely have an in-depth understanding of the 101 different kinds of cancer, or the finer points of chemotherapy drugs. We’re reluctant to share what we know because we are all too aware of the limitations of that knowledge, and of what is ultimately at stake.