This is a book about the most fearsome disease of modern times, which will strike every fourth citizen of a developed country sometime during his life: cancer. It is not a book about the prevention of cancer, but rather its treatment with plant-derived chemicals. It is an up-to-date and extensive review of plant genera and species with antitumor and antileukemic properties that have been documented in a strictly scientific sense. From the layman to the medical expert, the book is addressed to people seeking information on novel opportunities on disease therapy in order to make decisions about care programs. Purpose-wise, the book is written in colloquial style