Why do you think I mentioned it if I didn't know it to be true?

"Taxol® (NSC 125973)
Paclitaxel, the most well-known natural-source cancer drug in the United States, is derived from the bark of the Pacific yew tree (Taxus brevifolia) and is used in the treatment of breast, lung, and ovarian cancer, as well as Kaposi's sarcoma."